SMTP error 503 when sending mail with Windows Mail & Mobile Me:

Posted by Marty Pitt on Super User See other posts from Super User or by Marty Pitt
Published on 2010-10-20T16:59:16Z Indexed on 2011/01/10 23:55 UTC
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windows-7

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email

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mobileme

I've started getting an error on my windows machine when sending an email through Windows Mail, using Mobile Me:

An unknown error has occurred.

Subject 'Test' Server Error: 503 Server Response: 503 5.7.0 TLS already in use. Server: 'smtp.me.com' Windows Live Mail Error ID: 0x800CCC65 Protocol: SMTP Port: 587 Secure(SSL): Yes

I've checked and double-checked my credentials, and outbound mail settings, and they're correct. I've deleted and re-added the account, and I get the same issue.

I'm able to receive email fine.

Note - this issue only affects one PC - my laptop has no issues.

Any suggestions on what Error 503 means, or how I would fix this?

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