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From: Kris Deugau (kdeugauvianet.ca)
Date: Fri Aug 20 2010 - 14:05:50 CDT
> I have my own domain (on a dynamic IP) and run my own mail server but I
> use relay host to send mail through my ISP.
> I recently got this bounce:
> (reason: 554 Service unavailable; Client host
> [my_isp's_mail_server_host_name] blocked using Barracuda Reputation;
Some (many?) Barracuda filter appliances are (mis?)configured to
outright reject mail based on a deep scan of Received: headers. You can
try contacting abuse or postmaster on the recipient's domain... but
chances are one or both will be rejected. :(
You may have to contact the recipient by phone to let them know their
spam filter is rejecting legitimate mail.