Hello,
I have strict helo checks:
smtpd_helo_required = yes
smtpd_helo_restrictions = reject_non_fqdn_helo_hostname,
reject_invalid_helo_hostname,
reject_unknown_helo_hostname
now I have noticed mails being rejected:
Helo command rejected: Host not found
warning: hostname mail-eopbgr80085.outbound.protection.outlook.com
does not resolve to address 40.107.8.85: Name or service not known
full log here:
https://paste.ofcode.org/GK7Rnau3etXZmUsV5CbE7L
what exactly happened?
a) Are my settings too strict?
b) was there temporary interruption in DNS resolution?
c) or, is the domain really misconfigured?
thank you,
