Hi All, We have two customers who we're unable to receive email from. It's failing the helo lookup as it can't resolve the hostname in the helo message. Helo command rejected: Host not found;
The postfix configuration for helo checks is as follows. It's failing on reject_unknown_helo_hostname smtpd_helo_required = yes smtpd_helo_restrictions = reject_non_fqdn_helo_hostname reject_invalid_helo_hostname reject_unknown_helo_hostname The hostnames in the helo messages are resolvable with the PTR and A record. However there are 32 A records. I don't know if that's an issue which causes a problem with the verification. Maybe it can't match the IP address with the hostname as it does a round robin dns lookup and doesn't find the IP which the message arrived from? Has anybody come across this before and any idea how to resolve it? Thanks David
