Actually the reverse pointer doesn't have to match. In fact this is impossible if you are setting up virtual accounts on one server for different domains. You just need to have a reverse pointer.
Most email servers look to seen if the reverse pointer has a "dyn" in it and blocks those.
Original Message From: build+dovecot@de-korte.org Sent: October 26, 2020 2:02 AM To: dovecot@dovecot.org Subject: Re: SV: SV: Looking for a guide to collect all e-mail from the ISP mail server
Citeren Sebastian Nielsen <sebastian@sebbe.eu>:
Because when I email to friends that are using gmail, my mail ends up in spam unless my friends put me in whitelist. Seems to vary however, and seems to get better with time.
In order to prevent ending up in spam in GMail, it is necessary to have working DKIM and/or SPF for your messages and forward- and reverse DNS records for your mailserver match.