but the sender, rather than seeing the more descriptive message aboutwhat the problem is, sees only this:
554 smtp-in1.uah.edu ESMTP not accepting messages
Is this a problem with MD, my code, sendmail, or something else? Thanks...
This is by design. Your server is rejecting the connection, so there's no opportunity to pass messages to the client.
Are you sure? Because if that's the case, there's no reason for the second parameter in the return value for filter_relay.
I'll have to look for samples of filter_relay rejections, but I know our Sendmail-level DNSBL rejections successfully attach a message to the reject code.
I know this because occasionally someone will forward the error, complete with "550 5.7.1 No mail accepted from known spam hosts or virus sources -- see <URL to look up cause>." They don't seem to *read* it very often, and Outlook/Exchange have an annoying tendency to sanitize out the useful error with a generic one, but I do know it at least makes it out the door.
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