550 5.7.1 Client Does Not Have Permission To Send As This Sender
We have one user with an email address of EMAIL GONE but they use our exchange sever (email.xxxxxxxx.internal) to send email through.Within outlook 2007 we set the outgoing server to use authenitcation using a username and password within our domain but email is not being delivered to external addresses with the error 550 5.7.1 Client Does Not Have Permission To Send As This Sender.When we untick the authentification the error message of 550 5.7.1 Unable To Relay occurs.Our exchange is 2007 sp1Please help
October 14th, 2009 12:47pm

Is it a POP3 client? what do you mean "We have one user with an email address of EMAIL GONE"Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|
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October 14th, 2009 12:53pm

On Wed, 14-Oct-09 09:47:15 GMT, Nyall M wrote:>We have one user with an email address of EMAIL GONE but they use our exchange sever (email.xxxxxxxx.internal) to send email through.>Within outlook 2007 we set the outgoing server to use authenitcation using a username and password within our domain but email is not being delivered to external addresses with the error 550 5.7.1 Client Does Not Have Permission To Send As This Sender.>When we untick the authentification the error message of 550 5.7.1 Unable To Relay occurs.007 sp1So the sender uses AUTH and a user/password in your forest toauthenticate. Now, what's in the "MAIL FROM:" command and in the"From:" message header? Is it the same person?Assuming that the AUTH/MAIL FROM/From all agree, give the account"Send As" permission on itself. It sounds silly, but try it.---Rich MatheisenMCSE+I, Exchange MVP--- Rich Matheisen MCSE+I, Exchange MVP
October 14th, 2009 5:52pm

Hi,From the description, it seems that the Outlook 2007 is a POP3 client.Now I would like to confirm the following questions:Whether the user is not the internal user? Does the user has the external email address?If possible, please describe the issue in detail in order to provide the solution efficiently.ThanksAllen
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October 16th, 2009 12:23pm

Hi in my case, we use an smtp_util package to send the mail, We login as domain\username + password(both in base64) --> this part was OK, but the sender typed in the package not match exactly the account e-mail in exchange, so exchange refuses to send as another user(in our case that user even not exists) Regards
February 7th, 2011 11:19am

Perform a manually POP telnet session. Telnet exchangeserver110 User Myaccount Pass Mypass What is next error? James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com
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February 7th, 2011 11:30am

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