Email HELO Question

msound · 12-04-2006, 10:19 AM

What does the receiving mail server do with the HELO message? Does it perform a dns lookup of the domain name or ip address given? Or does it do something else? Thanks!

msound · 12-04-2006, 10:39 AM

Nevermind, I did a few more searches and found the answer here: http://www.postfix.org/uce.html

" reject_unknown_hostname
Reject the request when the hostname in the client HELO (EHLO) command has no DNS A or MX record. The unknown_hostname_reject_code specifies the response code to rejected requests (default: 450)."