In debugging email problems, a good way to eliminate variable introduced by mail client is to issue SMTP commands straight to the mail server. To do this, telnet to port 25 of your mail server and issue commands similar to the following:
# telnet 10.10.10.10 25 HELO test.example.com MAIL FROM: <firstname.lastname@example.org> RCPT TO: <email@example.com> DATA This is a te...
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