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My SMTP server is located in central Europe and I can connect to it just fine. However, a user from Japan was not able to connect to my server using Thunderbird.
I set it up together with him and used the exactly same options to rule out any mistakes.
Why is that so?
Does your smtp server use public blacklists? Your user might be in a blacklisted block. – GnP – 2014-03-04T18:01:12.150
No, the smtp server only checks for valid authentification. – MechMK1 – 2014-03-04T18:19:04.523
What troubleshooting have you done? Have you checked name resolution from the client? Trace route from the client? Telnet from the client? Etc., etc. – joeqwerty – 2014-03-04T18:37:36.303