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I keep getting the alert that Mail is unable to send with the selected server. I use the Mail connection doctor and .mac account and server are logging in ok.

This problem is intermittent - there are days I don't have any trouble, and today I have to try about 6 times to send an email. I get the problem at home and at work - both networks were fine yesterday.

I've switched from WiFi to Ethernet and the message eventually sent.