Yeah it resolves to the DSL host name not the mail.domain.com type name. Ping is turned off on the firewall and host resolution for that may be being blocked. I'll check with their IT guy and see if they can add something to their mail server to let us in.
Thanx
I have a client who used to be able to send to this email. Now they get this message. The other company says that everything is fine and they are not blocking. If anyone knows what this message means please let me know. NT SBS running exchange 5.5 with sonicwall firewall open on ports 80 and 25...
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