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550 Recipient address not accepted [message #1479] Mon, 03 July 2006 13:22 Go to previous message
Messages: 2
Registered: July 2006
Junior Member
Is it possible for NoSpamToday to output a '550 Recipient address not accepted' message via SMTP? Does NoSpamToday filter on recipient email addresses?

It looks like external mailservers are opening smtp connections to our mailserver, saying HELO, and then querying if the sender's mail account exists, presumably to determine the email was not sent with a spoofed or makebelieve email address.

At present the above message seems to be generated in the response from our mailserver. At first we thought it might be our mailserver software itself but after checking with the developers responsible for it, that software is only capable of returning messages like '503 5.5.1 Need MAIL before RCPT' where there is always an additional protocol message definition code (5.5.1) alongside the SMTP response code (503).

We're running in an environment whereby we have multiple domains all aliased to accounts on one mailserver. I don't know if that makes any difference.

Any suggestions welcome.


Richard Hall LRSM BSc MBCS
Software Developer
Source Software Ltd

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