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The transaction failed permanently. The server will not try to send the message again.
2 responses for SMTP 554
smtp;554 5.2.122 The recipient has exceeded their limit for the number of messages they can receive per hour. For more information go to http://go.microsoft.com/fwlink/?LinkId=526653. (#) [outlook.com]
This Outlook recipient hit the hourly receive limit from all senders. Wait and retry later at a lower rate to that mailbox.
smtp;554 5.2.121 The sender has exceeded the limit for the number of messages they can send to this recipient per hour. For more information go to http://go.microsoft.com/fwlink/?LinkId=526653. [#.prod.outlook.com #]
You hit the hourly send limit to this Outlook recipient. Wait and retry later. Spread traffic if many messages target one inbox.
8 responses for SMTP 554
smtp;554 delivery error: dd This user doesn't have a example.com account (example@example.com) [-9] - example.yahoo.com
Yahoo says this user does not have an account at that domain. Treat it as a hard bounce and remove the address.
smtp;554 delivery error: dd Sorry, your message to example@example.com cannot be delivered. This mailbox is disabled (554.30). - example.yahoo.com
Yahoo says this mailbox is disabled, often an account used only for login elsewhere. Suppress the address.
smtp;554 delivery error: dd Requested mail action aborted - example.yahoo.com
Yahoo aborted the requested mail action. Verify the address and content. Suppress it if the same abort keeps repeating.
smtp;554 5.7.9 Message not accepted for policy reasons. See https://postmaster.yahooinc.com/error-codes
Yahoo rejected this for policy reasons. Review content, authentication, and complaint rates before sending again.
smtp;554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit https://postmaster.yahooinc.com/error-codes
Yahoo rejected this on phishing suspicion. Review URLs and images. Request a review from Yahoo postmaster only after the content is clean.
smtp;554 Message not allowed - Headers are not RFC compliant[291]
Yahoo rejected the message because headers are not RFC compliant. Fix header formatting, then resend.
smtp;554 Message not allowed - [299]
Yahoo rejected the message for a policy rule. Review content and authentication, then retry carefully.
smtp;554 delivery error: dd example@example.com is no longer valid. [-20] - example.yahoo.com
Yahoo says this address is no longer valid. Treat it as a hard bounce and remove it.
1 responses for SMTP 554
smtp;554 5.7.1 [1] Message rejected under suspicion of SPAM; https://ya.cc/1IrBc ##
Yandex rejected this under spam suspicion. If you rarely send there, check signup forms for bot abuse. Otherwise clean content and list quality.
2 responses for SMTP 554
smtp;554 5.7.1 <example@icloud.com>: Relay access denied
Apple rejected this under a local policy. Ask the recipient to mark you as a VIP contact, or contact Apple postmaster with logs if it keeps failing.
smtp;554 5.7.1 [CS01] Message rejected due to local policy. Please visit https://support.apple.com/en-us/HT204137
Apple rejected this under a local policy. Ask the recipient to mark you as a VIP contact, or contact Apple postmaster with logs if it keeps failing.
1 responses for SMTP 554
smtp;554 5.7.1 Spam message rejected; If this is not spam contact abuse
Rambler rejected this as spam. Review sender best practices, then contact Rambler abuse if you believe it is a false positive.
2 responses for SMTP 554
smtp;554 5.2.3 MailPolicy violation Error delivering to mailboxes,mx.zoho.com
Zoho blocked delivery for a mail policy violation. Check Zoho community docs for the policy details, then adjust content or routing.
smtp;554 5.7.1 Email cannot be delivered. Reason: Email flagged as Spam.
Zoho flagged the email as spam. Clean content and authentication, then retry only if the send is legitimate.
1 responses for SMTP 554
smtp;554 5.2.2 <example@free.fr>: Recipient address rejected: Quota exceeded (mailbox for user is full)
This Free.fr mailbox is full. Retry later, or ask the recipient to free space.
2 responses for SMTP 554
host xx.comcast.net [x.xx.xx.xx] SMTP error from remote mail server after initial connection: 554 xx.comcast.net comcast x.xx.xx.xx Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: http://postmaster.comcast.net/smtp-error-codes.php#554
Comcast requires a valid PTR reverse DNS record on the sending mail server. Fix reverse DNS, then resend.
554 xx.comcast.net comcast x.xx.xx.xx Comcast block for spam. Please see http://postmaster.comcast.net/smtp-error-codes.php#BL000000
Comcast blocked this IP for spam. Review postmaster guidance, clean reputation, and request delisting before sending again.
1 responses for SMTP 554
smtp;554 Email rejected due to security policies - https://community.mimecast.com/docs/DOC-1369#554 [#]
Mimecast rejected this under security policies. Ask the recipient admin to review the policy hit if the mail is legitimate.
1 responses for SMTP 554
smtp;554 5.7.1 <email@example>: Relay access denied
Proofpoint denied relay access. Send only to accepted recipients for that tenant.
4 responses for SMTP 554
smtp;554 5.7.1 <example@example.com>: Recipient address rejected: BLOCK-SEND-ER.
Trend Micro blocked this under a send block rule. The recipient admin likely blocked your domain or IP. Ask them to allow it if appropriate.
smtp;554 5.7.1 <example@example.com>: Recipient address rejected: Invalid-Recipient.
Trend Micro says this recipient is invalid. Treat it as a hard bounce and remove the address.
smtp;554 5.7.1 <example@example.com>: Recipient address rejected: NO-DOMAIN.
Trend Micro does not allow routing for this domain yet. The recipient admin must allow your domain or IP before delivery will work.
smtp;554 5.7.1 <example@example.com>: Recipient address rejected: BLOCK-RCPT.
Trend Micro blocked this recipient under a recipient block rule. Ask their admin to lift the block if the mail is legitimate.
2 responses for SMTP 554
smtp;554 rejected due to spam URL in content
Barracuda rejected a URL in the content as spam. Check every link and domain against block lists, then resend without the bad URL.
smtp;554 rejecting banned content
Barracuda rejected banned content. Clean phrasing and links, then resend a safer version of the message.
1 responses for SMTP 554
smtp;554 5.7.1 <email@example.com>: Recipient address rejected: Not in recipient list
ZeroSpam rejected this recipient because it is not on the allowed recipient list. Ask the recipient admin to allow the address if it should receive mail.
Response catalog adapted from the MIT-licensed SMTP Field Manual by ActiveCampaign / Postmark.
