Posted by: R Manimaran | November 15, 2010

SMTP: Unable to rely for user1@domain.com Port 25 Secure (SSL). No, Server Error: 550

I have configured SMTP for email testing in my SharePoint Project. I have installed POP Service and created user and mail boxes. When I configure the users in Outlook and test sending mail, I have came up with the following error.

Error: Unable to rely for someuser. Port 25 Secure (SSL). No, Server Error: 550

Solution to rectify this error:

· Type Inetmgr in Run dialog and open Internet Information Services.

· Under Default SMTP Virtual Server Right Click and Select Properties.

· In the Access tab click the Relay button as shown.

· In the relay restrictions popup, You will see the following settings.

· Here Change the Option to “All Except the list below” as shown below.

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