Here's the complete error message (there are several like this)
z on 10/2/2007 11:43 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<tskorman.com #5.7.1 smtp;554 5.7.1 Service unavailable; Client host [126.96.36.199] blocked using dul.dnsbl.sorbs.net; Dynamic IP Addresses See: http://www.sorbs.net/lookup.shtml?188.8.131.52
The irony is we are not listed on SORBS.net, I don't know whose IP address that is (not ours).
We're using GFI Mail Essentials but I tested with that service not running and it returns with the exact error message. I'm also checking with GFI, awaitiing their response. Frustrating!!