Message rejected as spam
The receiving server rejected the message as spam.
What to do now
- Read the complete server reply for its rejection reason.
- Check SPF, DKIM and DMARC authentication for production mail.
- Review content, links, attachments, headers and MIME structure.
Representative reply
554 Message classified as spam
Retry decision
Resend after reviewing the rejection reason and message.
Why it happens
Content, authentication or sending reputation may trigger a spam policy.
Typical stage
DATA / END OF DATA
- CONNECT
- EHLO
- MAIL FROM
- RCPT TO
- DATA
- DELIVERY
Stages vary by server. Confirm the actual stage from the complete reply and session logs.
What is SMTP Reply Code?Open only the explanations you need
Three-digit server reply: 4xx is transient, 5xx permanent. Read the complete text to investigate the cause.
What is Enhanced Status Code?Open only the explanations you need
An extended status such as 5.1.1. Server wording and usage may vary.
What is DATA?Open only the explanations you need
The stage that sends headers, body and MIME data.
What is SPF?Open only the explanations you need
DNS policy identifying authorized senders for a domain.
What is DKIM?Open only the explanations you need
Verifies a domain signature using a public key.
What is DMARC?Open only the explanations you need
Policy checking alignment of the From domain with SPF or DKIM authentication.
Check directly
- Read the complete server reply for its rejection reason.
- Check SPF, DKIM and DMARC authentication for production mail.
- Review content, links, attachments, headers and MIME structure.
If you operate or diagnose the mail server, the tools below can help with these checks.
Cautions
Observed DSNs do not map one-to-one to causes. The stage shown is typical; confirm it with the full reply and actual logs.
Similar reply wording and observed status codes
rejected by our spamclassified as spamhigh probability of spam
Observed DSNs: Message first