email sending issue with outlook all of a sudden, please help!

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I cannot send e-maill all of a sudden from Outlook I get the following message:Your message did not reach some or all of the intended recipients. Subject: test Sent: 1/25/2018 10:22 AM The following recipient(s) cannot be reached: Christian Bissing ( on 1/25/2018 10:22 AM Server error: '550 5.1.1 relaying not allowed',
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Posted 2 years ago

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Drew N, Alum

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That is usually a configuration error. What are you using for the outgoing mail port? Also, are you using authentication for the outgoing server? What version of Outlook? POP or IMAP?

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