The email transaction failed. This usually means your message was rejected due to content or sender issues.
SMTP error 554 is a general permanent failure indicating the transaction could not be completed. It's often related to:
Your message contains words, links, or patterns that trigger spam filters.
Your sending IP or domain appears on email blacklists.
SPF, DKIM, or DMARC checks failed for your domain.
URLs in your message are flagged as malicious or suspicious.
Use our Blacklist Checker to see if your IP or domain is listed. Request removal from any lists.
Remove spam trigger words, excessive links, and suspicious attachments. Use plain text versions.
Ensure SPF, DKIM, and DMARC records are properly configured for your sending domain.
If legitimate mail is being blocked, contact the recipient's email provider for whitelisting.
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