|SYSTEM INFORMATION| |
Operating system Ubuntu Linux 20.04.3
Webmin version 1.984
Usermin version 1.834
Virtualmin version 6.17-3
Hi, there I recently configure my VPS with Virtualmin and I am a newbie.
I am able to send/recieve emails from all my Domins (VPS) via Usermin.
However, for only 1 domain, I get this error for outgoing email to Gmail:
<firstname.lastname@example.org>: host gmail-smtp-in.l.google.com[2a00:1450:400c:c1b::1a] said: 550-5.7.1 [2a02:c207:3008:6270::1] Our system has detected that this message 550-5.7.1 does not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information 550 5.7.1 . t14si4686088wmq.97 - gsmtp (in reply to end of DATA command)
I do not have an IPv6.
I am using hosting provided subdomain as hostname. (it might not be a best practice, but this is how things are at the moment)
I recently updated my self-signed SSL certificate for all domains but I am using Cloudflare as DNS for all my domains, so all domains are working fine, Except email problem in this one.
So please suggest.