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Error 554 No relaying allowed: psmtp

This Help Center article is for Postini, a suite of Google services that's now discontinued. If you're searching for instructions related to Google Apps, see the Google Apps Help Center. For instructions related to Google Apps Vault, see the Vault Help Center.
Issue: Outgoing messages from your mail server are rejected by the message security service with the error: "554 No relaying allowed - psmtp"

Symptoms: You are routing outgoing mail through the message security service. Since the security service does not handle mail for the sending domain, the traffic is bouncing.

Resolution: You can troubleshoot this issue as follows:
  1. Check the DNS MX entries for the mail server in question (e.g. for mail server From a UNIX prompt type: "dig mx"

    You may see results like this: 1H IN CNAME 1H IN MX 100 1H IN MX 200 1H IN MX 300 1H IN MX 400 1H IN MX 500

    In this case there is an CNAME entry for pointing back to the domain which has DNS MX records routing to the security service.

  2. Remove the CNAME and create an A record for the mail host.
Note: This article is intended for administrators using Message Security and Message Discovery. If you're using another edition, your service may include different features from those described in this article.
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