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Asked: 2026-05-11T01:46:54+00:00

Our custom automatic email delivery service is hitting this problem with a couple of

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Our custom automatic email delivery service is hitting this problem with a couple of our clients’ SMTP servers. It only happens with about three of them–the message is bounced back with the following response from the SMTP server:

SMTP error from remote mail server after end of data: host clients.host.name [XXX.XXX.XXX.XXX]: 554 Message is not RFC compliant

Here’s the email header generated by our custom application. Note that our own emails go through without any problems, but our application’s don’t.

Return-path: <ouremail@our.domain> Received: from [XXX.XXX.XXX.XXX] (helo=our.stmp.server) by clients.smtp.server with smtp (Exim 4.69) (envelope-from <ouremail@our.domain>) id 1LQNiv-0008MM-IM for clientsaddress@clients.domain; Fri, 23 Jan 2009 13:13:33 -0200 Subject: Test Mail From: <ouremail@our.domain> To: <clientsaddress@clients.domain> MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: ourCompany (ourcompanys.web.site) Importance: Normal Content-Type: multipart/mixed; boundary='OURCOMPANYSsoftsmtp123X4560102897C' X-Scan-Signature: e932e7231c8991cb29810b36327eaa17   --OURCOMPANYSsoftstmp123X4560102897C Content-Type: text/plain; charset='iso-8859-1' Content-Transfer-Encoding: base64  BASE64ENCODING  --OURCOMPANYSsoftstmp123X4560102897C--

Any ideas?

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1 Answer

  1. There are no Message-ID or Date headers in the messages being generated by your program. That may be why they’re getting rejected.

    Also, strictly speaking SMTP requires that the lines are CRLF delimited. I can’t tell whether that’s what you’ve got or not.

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