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i really don't understand how you are getting traffic on port 25 to transport via tor, it's disallowed by default. if you are talking about using a webmail service to send your mail via the webmail plugin via tor then that has nothing to do with it of course.
Not using the webmail plugin. The plugin appears only to work with free public webmail like yahoo and hotmail. So it wouldn't had worked with the webmail access most of us will typically have when using our own domain names.
I am running TOR as a test server (can't run a permananent once with dynamic IP) and not just as a client so did adjust some of the settings, so that would probably explain why port 25 works.