Hey anyone out there, We have an email that keeps getting blocked for some reason. It returns a message back that has this in the error output. Gmail is being used to send the email. I don't know what they use on their end to receive the email. Any ideas as to what do from here? I went to that spamhaus.org website, but you can't whitelist anything there that I can see anyways. I was going to whitelist mail-io0-f182.google.com
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain mbhr.net by d53827a.ess.barracudanetworks.com. [188.8.131.52].
The error that the other server returned was:
550 Service unavailable; Client host [mail-io0-f182.google.com] blocked by zen.spamhaus.org; 184.108.40.206 (email@example.com:blocked)