Hi, I get such an error when sending e-mail for a domain. Delivery status: Failed. Message to Be Delivered to the domain <safrestaurant.co.uk> could shout. Failed while initiating the protocol. <[('.......Safrestaurant.co.uk ', 550, '5 .7.1 Unable to relay')]> We use exchane 2007 and also added the domain to on Send Connectors. it is a problem not living other domains. How can I solve this problem. Thanks

You don't have to add the domain to your send connectors. The error isn't an Exchange error. Therefore the error is occuring further up the chain. If you are using a smart host for delivery, then it could be their issue, or it could be the recipients issue. Simon .Simon Butler, Exchange MVP Blog | Exchange Resources

do I need to do or check something ?

ok. i resolved the problem. Problem is dns settings.