Lucio Crusca writes:
<[email protected]>: mx.domain.com [xx.xx.xx.xx]: >>> DATA <<< 552 5.2.0 Invalid 7bit DATAThis happens while a user is trying to send a message with an attachment to [email protected], using Courier as outgoing SMTP server. Is there anything I can do on the Courier configuration? Although seems to me it's the remote SMTP complaining,
Correct. This is an error message from the remote mail server.
and not Courier itself, I suspect Courierhas something to do with that because that happens only since the migration toCourier.
That determination cannot be made until there's an actual explanation at hand for what that error message means. Only the remote mail server's administrator will be able to answer that question.
Googling around finds reports of this error message being returned by comcast.net's servers, and comcast.net's servers only. I was unable to locate any reports pointing to other domains.
Most likely something is broken with Comcast's mail servers. The dates and times of messages Google found suggests that they're too stupid to know what's broken, and how to fix it.
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