James wrote:
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;
http://bbl.barracudacentral.com/q.cgi?ip=my_mail_server's_ip)

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.

-kgd

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