asp.net - Mailbox unavailable. The server response was <firstname.lastname@domain.com> No such user here -


recently we've upgraded clients website our iis6 server our new iis7 server , receiving following error on occassion when sending out emails:

mailbox unavailable. server response <firstname.lastname@domain.com> no such user here 

the client has confirmed email address sending valid , exists.

what other reasons there error?


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