I installed iRedMail on VPS (Ubuntu). Fail2Ban
bans my home IP address.
In /var/log/mail.log
I see messages like:
postfix/submission/smtpd[32149]: warning: hostname unallocated.sta.lan.ua does not resolve to address 31.43.102.*: Name or service not known
unallocated.sta.lan.ua
as I understand is the hostname of my home internet provider.
31.43.102.*
is my home IP.
Where is the problem? Is it Internet Provider problem or my fault where my server\iRedMail is not configured properly (if so, how to fix)?