dlawton Posted October 27, 2005 Report Share Posted October 27, 2005 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. Quote Link to comment Share on other sites More sharing options...
kevin Posted October 27, 2005 Report Share Posted October 27, 2005 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. Quote Link to comment Share on other sites More sharing options...
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