Anyone see a problem if I login into the smtp server with Username
different than the Return-Path?
It seems to work OK; but, I know from experience using the mail servers
that increasingly everything must be exactly right to prevent recipient
mail servers from rejecting emails.
All the email servers I have worked with only care about the proper
authentication credentials and accept any valid email address for From:
Reply-to and so on. Free services, like Googlemail.com, may differ.
The receiving server on the other hand will usually do a domain
validation of the From: field to ensure that the domain exists, validate
the SPF record and do a few other anti spam tricks.
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