I am afraid, that spam filters receiving emails from it
will rate emails down, because of the NAT and the private IP.
It's NAT that already gives your container access to public IP and also
protects it from spammers outside. There are other ways but you really
don't need them unless you want to receive mail too.
If you care about your reputation against spam filters, make sure your
public IP has DNS record (most likely your ISP already took care of
this), and configure SPF records for your outgoing mail domains.
--
With Best Regards,
Marat Khalili
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