Fix 564 Sender Not Authorized Error | Email List Validation

Why Is Your AWS SES Email Getting Rejected With 564 Sender Not Authorized?

You sent a transactional email through AWS SES. It failed. The error code: 564 sender not authorized. You didn’t get a bounce message. You didn’t see a blocklist hit. Just a silent rejection at the SMTP level.

This isn’t spam. It’s not a deliverability issue. It’s a direct authentication failure: AWS SES knows your domain, but it doesn’t trust the sender address you’re trying to use. The 564 error is a hard stop — not a soft filter. It breaks onboarding flows, transactional receipts, and automated campaigns. And fixing it requires understanding AWS SES’s sender authorization model, not just tweaking a DNS record.

Every time you see this error, know it’s because a sender address isn’t properly linked to a verified identity in AWS SES. No exceptions. No workarounds. It’s a deliberate security guardrail, and it’s doing exactly what it’s supposed to.

Key takeaways

The 564 error occurs when AWS SES rejects an email because the sender’s address isn’t explicitly authorized to send from the domain in use.
Authorization must be configured in AWS SES for each sender address or domain; no default trust is assumed.
Fixes require verifying sender identities, aligning the "From" address with the verified domain, or properly configuring MAIL FROM and RETURN-PATH headers.

What Exactly Causes the 564 Sender Not Authorized Error?

You get the 564 Sender Not Authorized error when AWS SES refuses to send an email because the sender address isn’t verified in your account, or its domain lacks proper email authentication (SPF, DKIM, DMARC). It can also happen if you're using a role address like admin@ without explicit domain permission, or if you're sending bulk mail without assigning a dedicated sender identity. The system checks these factors strictly — one misstep breaks the chain.

Senders and Domains

You're sending from an email address that hasn't been verified in AWS SES, even if the domain seems trusted.
The domain behind the sender address doesn’t have valid SPF, DKIM, or DMARC records in DNS — a common oversight when managing multiple domains.
You're using a role address (e.g. support@, billing@) that AWS doesn’t associate with your verified identities unless explicitly authorized.

Bulk Sends and Identity Missteps

You're sending to a large list using a single "from" address that lacks the full authentication setup required for mass distribution.
You’re using a generic sender identity for bulk messages instead of setting up a dedicated sender (like [email protected]) with verified credentials.
You’ve enabled sending from a domain that’s not verified in AWS SES, even if it’s your own — the domain must be explicitly approved in the SES console.

AWS SES enforces these checks to prevent spoofing and maintain deliverability. A misaligned sender or unverified domain is treated the same as a malicious sender, even if you're trying to deliver legitimate mail.

SPF, DKIM, and DMARC are foundational to modern email authentication. SPF tells receivers which servers are allowed to send on behalf of your domain — without it, many providers mark your email as suspicious. DKIM adds cryptographic signing, so recipients can confirm the email wasn’t altered in transit. DMARC defines policy: what to do with messages that fail SPF or DKIM checks. All three must be properly configured for consistent inbox placement.

For instance, a domain without a valid SPF record may be blocked by major providers like Gmail or Outlook, even if the sender address is correct. You can verify setup using tools like MXToolbox or RFC 7052, which describes best practices for domain-based message authentication.

To prevent these issues before sending, validate your list thoroughly. Clean lists with invalid or poorly formatted addresses reduce delivery chances and can trigger sender reputation issues. Use tools like our bulk email list cleaning to audit and filter out problematic addresses before sending with AWS SES. This includes catching invalid domains, role addresses, and disposable email addresses that often fail authentication.

How to Fix 564 Sender Not Authorized: A Step-by-Step Process

You’re getting a 564 sender not authorized error in AWS SES because the email address or domain you’re sending from isn’t properly verified or aligned with your DNS records. Fix it by confirming the sender is in your SES verified identities, validating your SPF and DKIM, and ensuring the FROM header and MAIL FROM address match. Use SES’s built-in verification to catch issues early.

Check that the sender email address is listed in your AWS SES verified identities. You can’t send from any address unless it’s explicitly verified in the SES console. Use the AWS SES console to confirm it’s in the 'Verified identities' list.
If the address isn’t listed, navigate to the SES console and verify the full email address or your domain. Verifying the domain is usually better for bulk sending, as it allows you to send from any address under that domain without individual verification.
Ensure your domain’s SPF record includes include:amazonses.com. Without this, your emails fail SPF checks, leading to 564 errors. The SPF record must be published at the domain level and correctly formatted—no duplicates, no conflicting mechanisms.
Confirm DKIM is enabled in SES and the required TXT records are published in your DNS. SES generates three records for DKIM. If any are missing or misconfigured, your messages aren’t properly authenticated, and receivers reject them.
Verify the sender address in the SMTP MAIL FROM command matches the From: header in your email. If you send from [email protected] but use [email protected] in the MAIL FROM, the 564 error appears. This alignment is required by RFC 5321.
Use SES’s built-in email verification capability to validate addresses before sending. This reduces bounces and improves sender reputation, helping avoid issues that trigger 564 errors in the first place. It’s a quick check for high-risk or new addresses.

Why These Steps Matter

Each step ensures your sender identity is both valid and trusted by recipient systems. SPF blocks unauthorized senders; DKIM proves authenticity; and proper alignment prevents spoofing. Skipping any one opens the door to a 564 error.

Verify Before You Send

Even if your setup is correct, sending to invalid or misconfigured addresses harms deliverability. Use a trusted email validation tool like bulk list cleaning to pre-check your list. This reduces bounce rates, strengthens sender reputation, and prevents SES throttling or suspension.

Why Sender Identity Verification Is Non-Negotiable in AWS SES

You can’t send emails through AWS SES unless you’ve verified the sender identity—whether it’s an email address or domain—because AWS blocks any message that claims to come from an unverified identity. This isn’t a suggestion; it’s a strict requirement to prevent abuse, spoofing, and spam. Without verification, your messages won’t deliver, and you’ll see a 564 sender not authorized error. Verification establishes accountability and is essential, especially if you're scaling beyond a few hundred emails per day.

How AWS SES Enforces Sender Identity

AWS SES treats every sender identity as a potential attack vector. If you try to send from an address like [email protected] without first verifying it, SES will reject the message with a 564 error. This applies to both individual email addresses and entire domains. You’re not required to confirm every single address, but you do need to verify the domain or the specific email address you’re using to send.

Domain verification is where things scale. If you’re sending to thousands of users daily from a domain, verifying that domain via DNS records (TXT or CNAME) allows you to send from any email address under it without individual verification. This is the only way to build a reliable, automated sending system in SES.

Why It Matters Beyond Just Bypassing Errors

Verification isn’t just about avoiding code 564—it’s how AWS ensures that only legitimate senders use its service. This prevents spammers and bad actors from impersonating brands, protecting both the sender and the receiver. According to the RFC 5321, mail servers should authenticate sender identities, and SES enforces this at the protocol level.

Without verification, you’re operating in a gray zone. Even if your message somehow gets through, it’ll likely land in spam folders or be flagged by advanced filtering systems. The 564 error is just the front door; the real cost is ruined sender reputation and deliverability over time.

For teams managing large lists, manual verification isn’t viable. That’s where tools like bulk email list cleaning help—by identifying invalid, risky, or disposable addresses before you even attempt to send through SES, you reduce the chance of errors and improve overall deliverability. Verification is just the first step. Clean data is what keeps your reputation strong.

The Role of SPF, DKIM, and DMARC in Preventing 564 Errors

The 564 sender not authorized error in AWS SES happens when recipient servers reject emails due to misconfigured email authentication. SPF, DKIM, and DMARC work together to prove your domain authorizes AWS SES as a sender, prevent spoofing, and ensure messages arrive in inboxes—not junk folders or blocked entirely. You must set all three correctly to achieve reliable deliverability.

How Each Protocol Prevents 564 Errors

SPF (Sender Policy Framework) tells receiving servers which mail servers are allowed to send on your domain’s behalf. Without a valid SPF record pointing to AWS SES, your emails are rejected with errors like 564. DKIM (DomainKeys Identified Mail) cryptographically signs each email, proving it wasn’t altered during transit—this builds trust with providers like Gmail, Yahoo, and Outlook.

DMARC (Domain-based Message Authentication, Reporting & Conformance) ties SPF and DKIM together. It tells receivers what to do if either test fails—either quarantine or reject—and provides reports to help you monitor delivery health. Without DMARC, receiving servers may accept messages that fail SPF or DKIM, reducing trust over time.

Real-World Configuration Reference

Here’s how each protocol functions in practice, based on standards from the IETF and common industry configurations:

Protocol	Function	Required For 564 Prevention?	Implementation Example (AWS SES)
SPF	Authorizes mail sources via DNS TXT record.	Yes	`v=spf1 include:amazonses.com -all`
DKIM	Uses cryptographic signatures to verify message integrity.	Yes	Enabled automatically in AWS SES via key generation.
DMARC	Defines policies for handling failed SPF/DKIM and enables reporting.	Yes	`v=DMARC1; p=none; rua=mailto:[email protected]`

According to RFC 7208, SPF is the first line of defense in sender validation, while DKIM ensures message integrity per RFC 6376. DMARC, defined in RFC 7483, combines both into a cohesive policy framework. If any of these three are missing or misconfigured, you risk 564 errors and inbox placement issues.

Let’s say you’ve fixed SPF and DKIM but still see bounces. Chances are DMARC isn’t enforced. Even if SPF passes, without DMARC, some receivers may still reject emails based on alignment failures. Run a full email authentication check using tools like MxToolbox or use our inbox placement test to simulate delivery and catch alignment gaps before they cost you real engagement.

How List Hygiene Prevents 564 Errors Before They Happen

You’re getting a 564 “sender not authorized” error not because of AWS SES configuration, but because your list includes invalid or role-based addresses that were never authorized to receive mail. These send attempts create friction when the receiving server checks sender identity and finds no valid recipient. Cleaning your list beforehand—removing bad, catch-all, or role accounts—ensures you only send to addresses that actually belong to real people, reducing sender reputation strain and preventing delivery errors before they start.

Why Invalid or Role Addresses Trigger 564 Errors

Role accounts like admin@, support@, or info@ are often flagged as high-risk by email providers. They frequently receive bulk mail, are used for automated systems, or never check inboxes. When you send to them, especially at scale, recipients may not acknowledge, and the sending server treats these attempts as signs of poor list quality. This weakens your sender reputation and increases the likelihood of a 564 rejection.

Even a single invalid address can be enough to trigger a 564 in some cases—especially if your list isn’t cleaned. But when 10% or more of your list consists of such addresses, your sender identity becomes unstable. The receiving server sees repeated delivery attempts to non-existent or non-responsive recipients, and responds by blocking or tagging your next messages as unauthorized, even if you’re technically setup correctly.

How Proactive List Cleaning Prevents Issues

Tools like Email List Validation analyze each address in your list using real-time SMTP checks, domain validation, and role account detection. They don’t just guess—they perform actual connection tests to confirm if an address exists, whether it’s a catch-all, and if it’s likely to respond to mail.

With that data, you can remove high-risk entries before your first send. An inbox placement test with Email List Validation can also simulate how well your email will land in real inboxes, including for addresses that are valid but risky. This isn’t a one-time fix—it’s a continuous guardrail against bad data.

Think of it like tightening your email delivery pipeline. When only real, responsive recipients are in your list, your sender identity stays clean. That’s how you avoid 564 errors not by adjusting configuration, but by refusing to send to unverified or unauthorized identities in the first place.

For teams using AWS SES or similar transactional services, the best defense against delivery failures starts with your list. The same rules apply whether you're using Mailchimp, Klaviyo, or SendGrid—if your list isn’t clean, your delivery fails.

Use our bulk verification tool to find and remove invalid, catch-all, or role-based addresses from your list before sending—before AWS SES or any other provider says “sender not authorized.”

Integrate Email List Validation to Catch 564 Risks in Advance

Run every email in your list through a real-time verification process before sending via AWS SES. This prevents the 564 Sender Not Authorized error by catching invalid, catch-all, disposable, or role-based addresses that would otherwise trigger rejection. You’re not just cleaning data — you're validating the sender authorization path before it fails.

Prevent 564 Errors with Proactive List Cleaning

Use bulk list verification to scan your entire email database before uploading to AWS SES — flagging 98.9% of invalid or risky addresses in a single pass.
Integrate the real-time verification API at signup or checkout to stop invalid emails from ever entering your system, reducing bounces and protecting sender reputation.
Run inbox-placement tests to simulate delivery across major providers and verify that your messages land in inboxes, not spam folders — a critical check before scaling sends.
Identify catch-all domains that accept any address, which can inflate your send volume with non-existent users and hurt deliverability.
Block disposable email domains (like tempmail.org) that are commonly used for spam or bot registration — these often trigger AWS SES rejection or filtering.
Filter out role-based addresses (e.g. admin@, support@) that are not individual recipients and typically result in automated bounces or no replies.

Why This Works Where Other Tools Fall Short

Many validation tools only return "valid" or "invalid" with low precision. Email List Validation goes deeper: it returns granular verdicts like catch-all, disposable, or risky — each with documented implications for delivery risk.

AWS SES enforces strict sender policies based on DNS records (SPF, DKIM, DMARC). If a recipient domain rejects your IP due to misconfigured or unverified identities, you get the 564 error — not because your message is bad, but because the sender wasn’t properly authorized. Catching those edge cases early avoids repeated sends that can trigger sender reputation penalties.

For example, RFC 5321 specifies that a recipient server can reject mail from a sender it doesn’t recognize. A catch-all address may accept the message, but a real user never sees it — making it a red flag for services like AWS SES that prioritize engagement.

Clean your list at scale with detailed reports showing risk types and removal reasons. You’ll see exactly which addresses were invalid, disposable, or role-based before they ever triggered a 564 error.

For ongoing protection, tie your verification API into your signup flow. As soon as a user enters an email, validate it instantly — blocking fake or temporary addresses before they reach AWS SES or your CRM.

Common Mistakes That Trigger 564 Errors Even After DNS Setup

You’re getting the “564 sender not authorized” error on AWS SES even after setting up DNS? It’s not always about missing records—more often, it’s misconfigured sender policy, subdomain misuse, or SPF messes. Let’s fix what’s actually broken.

Sender Policy Issues

You’re sending from a From header address that isn’t verified in SES, even if the Source domain is. AWS SES checks both the From address and the Source domain. If the From isn’t authorized, the 564 error fires.
Using a subdomain (like [email protected]) without verifying it in SES. You must verify each identity individually. A verified domain doesn’t cover its subdomains unless explicitly added.
Having multiple SPF records for your domain. SPF allows only one record. If you deploy two, DNS validation fails and your email gets rejected. Merge all records into a single, compliant TXT record.

Template and Identity Misuse

Reusing transactional templates with hard-coded From addresses across different domains. AWS SES treats each verified identity as isolated. Sending from [email protected] using a template built for [email protected] triggers the 564 error because the sender isn’t authorized for that identity.
Not validating your email list before sending. Invalid or non-existent email addresses can trigger secondary delivery checks, especially when mixed with verified senders. Use real-time email validation to catch malformed or non-existent addresses early.
Running bulk campaigns without verifying your sending practices. High-volume sends from unverified identities, even if technically correct, can trigger rate limiting or reputation-based blocks. Always validate sender identities and maintain strong authentication (SPF, DKIM, DMARC).

SPF errors are among the most common causes—according to the SPF RFC 7208, duplicate records break sender authentication. Similarly, AWS SES documentation makes clear that only verified identities can be used as senders.

If you're still stuck, check your sender address against your full identity list. A single wrong address in the From header can invalidate an otherwise correct setup. Use bulk email list cleaning to identify and remove invalid or misconfigured addresses before sending. That includes fixing the sender fields that trigger the 564 error.

How to Test for 564 Errors Before Campaign Launch

You can catch the 564 sender not authorized error before it derails your AWS SES campaign by sending a small pilot to 10–20 real recipients using your actual sender address and domain. Check AWS SES send reports for SMTP-level rejections, run inbox-placement tests across major providers, and review bounce logs and DMARC reports for alignment issues. These steps catch config problems early—before they damage sender reputation.

Send a pilot batch of 10–20 emails from your verified AWS SES sender address and domain. Use real recipient addresses from your list, not test-only or dummy ones. This simulates actual delivery conditions and exposes configuration flaws early, such as failing SPF/DKIM checks or missing domain authorization.
Check the AWS SES send report for any 564 status codes or other SMTP-level rejections. A 564 response means the receiving server explicitly refused delivery due to sender authorization failure—usually because SPF, DKIM, or DMARC policies are misconfigured. AWS logs these details, so cross-reference the failure reason with your email setup.
Use inbox-placement tools to simulate delivery. Test your message across Gmail, Outlook, Yahoo, and other major providers before full launch. Tools like Email List Validation’s inbox-placement service simulate delivery in real consumer environments, revealing if your message is flagged as spam or blocked by recipient filters based on content, header structure, and reputation signals.
Review bounce logs and DMARC reports for signs of misalignment. Bounce logs will show if recipients rejected your message due to sender mismatch. DMARC reports (available via tools like Spamhaus or your email provider’s reporting portal) reveal whether your domain’s DMARC policy is correctly enforced and whether unauthorized senders are impersonating your domain.

Why Pilot Testing Matters

Without a pilot, you’re sending blind. The 564 error isn't always obvious in logs—it's often buried in a sea of successful deliveries. Catching it early prevents sending batches to large lists only to see them fail. It also protects sender reputation: repeated delivery failures due to authorization errors can trigger throttling or even blocking by AWS SES or recipient providers.

How to Fix What You Find

Once you see a 564, verify your SPF record includes your AWS SES sending IP range. Check DKIM signing is active and correctly published in DNS. Confirm your domain’s DMARC policy allows delivery from AWS SES and review the alignment of the "From" header domain with SPF/DKIM. RFC 7208 (the DMARC spec) outlines alignment requirements—implementing them correctly reduces the chance of 564-level rejections.

What to Do When 564 Errors Persist After Fixing Setup

If you’re still seeing the 564 "sender not authorized" error after verifying your identity in AWS SES, it’s likely due to a mismatch between your email’s MAIL FROM and your verified identity, or an identity conflict from another AWS account, configuration, or third-party tool. Let’s walk through the most common culprits that linger even after setup.

Verify the Sender Address Was Actually Verified in This Region

Just because you verified an email in one AWS region doesn't mean it’s valid in another. The identity must be confirmed in the exact region where you’re sending. Check your SES console in the current region—don’t assume verification carried over.

Amazon SES enforces regional identity binding strictly. You cannot send from a verified email in us-east-1 if your current session is in eu-west-1. This is spelled out in the official AWS documentation on identity management.

Watch for Identity Conflicts and Shared Pools

If you’re using a shared SES configuration—say, through a third-party tool, a serverless function, or another AWS account—check whether the sender identity is being overridden. AWS can allow multiple configurations to coexist, but only one sender identity can be active per request context.

Even if your email is technically verified, sending from a shared pool (like SES’s default "send through" endpoint) without explicit identity binding can trigger the 564 error. Always bind your MAIL FROM to a verified identity, even if you’re sending from a different From address.

Here’s the key: use a verified email address as MAIL FROM, regardless of what appears in the From header. It's a common mistake to set the From header to a company-branded address (like [email protected]) but leave MAIL FROM as something not verified. The receiving mail server checks MAIL FROM, not the visible From field, for sender authorization.

Use tools like real-time email verification to test if sender addresses are valid before sending, especially when managing a large email list. This helps catch invalid or unverified identities early and reduces the chance of deliverability failures due to sender validation.

Conclusion: Prevent 564 Errors by Validating Identity and List Quality

The 564 sender not authorized error is not a policy denial — it’s a technical signal that your sender identity isn’t authenticated or your list contains invalid addresses. This is avoidable.

Properly setting up SPF, DKIM, and DMARC ensures AWS SES trusts your domain. Complement this with a verified, cleaned email list to eliminate bounce risks and reputation damage.

Use real-time and bulk email verification to detect invalid, disposable, or catch-all addresses before sending. This combined approach stops delivery failures at the source.

Keep reading

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Frequently asked questions

What does the 564 sender not authorized error mean in AWS SES?

It means AWS SES rejected a message because the sender email address or domain isn’t verified in your account or doesn’t meet authentication requirements.

Can I send from any email with a verified domain in AWS SES?

No — you must verify each individual email address or domain in AWS SES. Sending from unverified identities triggers the 564 error.

Do I need to verify each sender email address in AWS SES?

Yes. You must explicitly verify every email address you send from. Domain verification is also required for broader use.

How do I fix a 564 error when my SPF record is already set?

Ensure the SPF includes 'include:amazonses.com' and that the sender address matches the verified identity in AWS SES.

What is the best tool to prevent 564 errors by cleaning email lists?

Email List Validation uses 98.9% accurate checks to flag invalid, catch-all, role, and disposable email addresses before sending.

Does sending from a different domain than my verified one cause 564 errors?

Yes. AWS SES only accepts messages from verified identities. Sending from an unverified domain triggers a 564 error.

Are role accounts like admin@ or support@ a common cause of 564 errors?

Yes — if not verified, these addresses are rejected unless they are part of a properly configured and verified domain identity.

How can I test if I’ll get a 564 error before sending a full campaign?

Send a small test batch with real sender identities and analyze the SES delivery report and bounce logs.

Can I use AWS SES to send from a non-verified sender email?

No. AWS SES blocks all messages from sender identities not explicitly verified in the console or via API.

Does DMARC help prevent 564 errors?

Not directly, but proper DMARC alignment ensures receiving servers accept your messages. Misalignment can lead to rejection, but 564 is an SES-specific auth failure.

What happens if I send to an invalid address with a verified domain?

The message may be accepted by AWS SES but will bounce later. Invalid addresses hurt sender reputation and increase delivery risk.

How does Email List Validation help with 564 error prevention?

It identifies invalid, catch-all, role, and disposable addresses in advance, reducing the chance of unauthorized sends and improving list hygiene.