Solved email error 5.1.0

September 4, 2011 at 09:18:25
Specs: Windows 7
Help, i keep getting 5.1.0 - Unknown address error 550-'Requested action not taken: mailbox unavailable'
when i send an email to a certain address......??

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#1
September 4, 2011 at 09:51:42
✔ Best Answer
Make sure you have the email address correct. If it keeps bouncing back, it could be something on their end.

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