Unable to add SMTP to Mautic, Same credentials work on WebMail Rainloop

but same credentials work on Rainloop and other email clients like gmail app etc.
Tried Host as vmi777668.contaboserver.net as well, which is the PTR

with rainloop

show results of //email/testTo:

DNS was already MX pointing to Hostname, instead of mail.domain.tld but server TLS was still replying mail.domain.tld instead of hostname. Deleted mail.domain.tld but still the TLS was replying it.

Fixed after i re-issed Mail SSL on hostname. Now it replies hostname on TLS call. and certf is valid.
Emails no longer bouncing. Cheers! Eid Mubarak!

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