Google 550-5.7.1 Email Settings Error

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:

<>: host[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 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.

Well adding the proper SPF records at cloudflare fixed my issue

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