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Deborah Kelley Level 1 Level 1 (5 points)
Hello,

I think this started last night (or very early this morning, my brain is fuzzy). I've been travelling about and somehow recently whenever I try sending an e-mail from my .mac account through the Mail application, I get a message that says:

"Cannot send message using the server smtp.mac.com

The server response wax: 5.5.1 Invalid user / domaine name.

Use the pop-up menu below to try a different outgoing mail server. All messages will use this server until you quit Mail or change your network settings." . . .

So far I've tried deleting the account in Mail and re-adding it, adding "@mac.com" to my username, re-entering the password to be sure it's correct, re-starting Mail, restarting my computer, and changing the port setting.

I don't think this is a problem with my ISP (Comcast, I'm in Seattle), because this started when I was in Calgary using my hotel's wifi, then at the airport in Vancouver using some other wifi &c.). It just started randomly. One day it worked, the next day it didn't.

I AM able to, say, send it through smtp.gmail.com, but I'm wary about that because I'm worried that some e-mail providers will see that the "from" e-mail address doesn't match the server and will mark it as spam (I'm not 100% sure of this, but I think that can happen and I don't want to risk it). Sending from the webmail works just fine of course, but I don't like doing that.

Is anybody else having this problem, and does anybody have a solution? Thanks.

MacBook Pro 15", Mac OS X (10.4.9)
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