Can't send mail: server cannot verify

I have been unable to send mail from ONE of my accounts for a few days. My host has been helping but no luck. Green lights in connection doctor, no problems with another a/c on the same server.
tried changing port to 587, changing / deleting server list.
Any suggestions welcome. Tried clicking 'ssl' as suggested in one thread but port didn't change. so far have tried 25 and 587. No problem telnetting to the server on 25 or 110.
Not tried changing port to 110 yet. (Host has not suggested this)

What kind of account is this, POP or IMAP? Who is the ISP/email provider? What are the specific settings for Incoming and Outgoing servers, including port numbers, authentication method, and whether or not SSL is enabled on each?
Mulder

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