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#5.5.0 smtp;554 - 5.Mar.2007 1:03:42 AM

triocom

Posts: 1
Joined: 5.Mar.2007
Status: offline

I'm getting the following returns message contents when I email specific domains. I'm not sure exactly how to resolve this, so any advice would be helpful. I'm running Windows SBS 2003 with SP2 on Exchange. I believe I have reverse DNS running (whatever is the default - 192.168.0.xx) also not sure about SPF and how to ensure that's running correctly.

Thanks

There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.

<domain.name #5.5.0 smtp;554 <unknown[##.##.##.##]>: Client host rejected: Reverse DNS lookup was unsuccessful>