SMTP Error 554 - Transaction Failed / Message Rejected

What does this error mean?

SMTP error 554 is a general permanent failure indicating the transaction could not be completed. It's often related to:

Message content triggered spam filters
Sender IP or domain is blacklisted
Email authentication failures (SPF/DKIM/DMARC)
Recipient server policy rejection

Common Causes

report

Spam Content Detected

Your message contains words, links, or patterns that trigger spam filters.

block

IP/Domain Blacklisted

Your sending IP or domain appears on email blacklists.

gpp_bad

Authentication Failure

SPF, DKIM, or DMARC checks failed for your domain.

link_off

Malicious Links

URLs in your message are flagged as malicious or suspicious.

How to Fix

1. Check Blacklist Status

Use our Blacklist Checker to see if your IP or domain is listed. Request removal from any lists.

2. Review Email Content

Remove spam trigger words, excessive links, and suspicious attachments. Use plain text versions.

3. Fix Email Authentication

Ensure SPF, DKIM, and DMARC records are properly configured for your sending domain.

4. Contact Recipient's Postmaster

If legitimate mail is being blocked, contact the recipient's email provider for whitelisting.

Example response

554 5.7.1 Message rejected due to content restrictions
554 5.7.1 [x.x.x.x] blocked by spamhaus
554 Transaction failed: spam detected
554 5.7.9 Message not accepted for policy reasons

Related SMTP Errors

550 Mailbox Not Found 553 Invalid Mailbox Name 552 Message Size Exceeded 451 Local Error

Transaction Failed