postfix/smtpd: NOQUEUE: reject: RCPT from mail.xxxxx.com[207.999.88.777]: 450 4.7.1 <barracuda.xxxx.com>: Helo command rejected: Host not found; from=<firstname.lastname@example.org> to=<email@example.com> proto=ESMTP helo=<barracuda.xxxx.com>
So, I look up xxxx.com and it checks out 207.999.88.777 (I faked this address & the xxxx.com to protect them). However barracuda.xxxx.com doesn't exist. Hence the proper rejection. It looks like they installed a barracuda firewall server recently and that blew it up. We used to receive email from them just fine and then all of a sudden @3 in the afternoon one day blammo.
When I contact them I get TOTALLY flamed. He's claiming I changed my configuration and it's improper and won't ever work even for may own email. Obviously, I haven't changed anything in a year and all our other email works fine.
Here's the problem. This is a big customer for use and we can't upset them. Is there any way I can white list their barracuda.xxxx.com to let it pass.
Thank you so much in advance for any help