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It might be the case that you aren't correctly logging on to the server. I run my own mail server at home, and I have restricted to a limited range of IP addresses & require login & password before sending e-mail is allowed. (I got burned one time by a hacker using my server to send spam). If you aren't sending the correct user name/password, you will be seen as unauthorized and will not be allowed to send. Good luck figuring it out.
Gary Duncan
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