mail program doesn't send messages

radders

Registered
Since last weekend, I cannot send email from Mail. Contacted the ISP and checked all settings which are good. Can receive OK. We use 2 usps - one for collection and because BT are broadband supplier send through them. Been successful for over a year now.

Will work through their web mail directly (BT.Yahoo) but not from Mail. Thought maybe account was corrupt. Set up new account - same message. Tried new mail program (Thunderbird) same result. Without reinstalling the operating system, any clues?

Only thing I can think of is Spam Sieve has recently been installed, perhaps that has corrupted the port?

Hopefully you can shed light on this.
 
Try changing the port of the outgoing mail from 25 to 587 in the Mail preferences.
(It should work with both, at least should have worked until now..)
 
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