On 14.09.20 14:35, Philipp Ewald wrote:
we have one customer the reported problems about HELO. We send the RFC821 HELO for only DOMAIN not FQDN. The customer scanning the helo and check the PTR and if the PTR don't match the HELO there is SPAM rating.
this is forbidden by any SMTP RFCs issued so far. that customer is apparently losing too much mail - last time I checked, google, aol, yahoo SMTP servers used HELO strings that did not resolve back to those IPs. what really matters is: 1. the PTR of connecting should be resolvable and the resulting hostname should resolve back to the IP. 2. the name in HELO/EHLO should be resolvable and should have A/AAAA record
I don't really like that but we think about to check the HELO too. Does anyone else checks the HELO/ELHO?
very few. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. Saving Private Ryan... Private Ryan exists. Overwrite? (Y/N)
