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Relay Exception


dlawton
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I cannot send mails from ME to external addresses. I have set the SMTP server to the server of my company, copies to internal addresses are fine, but CCs to external addresses give the error "Exception: 550 5.7.1 Unable to relay for XXXXXXXX

 

This used to work until my company changed Mailserver.

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A Google search turned up tons of references. I found the following interesting:

the solution seems to be to configure your Exchange server to use your ISP's DNS server.
The full article can be found here.

 

If you are getting the "550 Relay Denied" error message, the outgoing mail server cannot verify who you are and will not allow you to send mail.
The full article can be found here.

 

Read Microsoft's knowledgebase article titled 'How to Configure the IIS SMTP Service to Relay SMTP Mail' here.

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