eMail Problem

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Whenever I try sending mail with Outlook on windows through the iCloud server, I get: An unknown error has occurred. Account: 'my mail', Server: 'smtp.mail.me.com', Protocol: SMTP, Server Response: '334 ', Port: 587, Secure(SSL): Yes, Server Error: 334, Error Number: 0x80004005 Anybody know about this?

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