Al wrote:
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, 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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