Hi, The is a rather annoying and persistent problem. Even though my mail server never has been abused to send spam or any other bad behavior. Google keeps making mails that are send through our server either disappear, delivered to a junk folder or deliver it to the mailbox. Chances are 1/3 that it gets delivered. To handle this I did the following for @gmail.com: https://www.howtoforge.com/community/threads/use-smarthost-for-some-domains.78820/ But lots of ordinary domains also use the mailservers of google. So my list gets longer and longer but of course the main issue is you never know if the recipient receives your mail if they are using Google if I haven't had them added to the transport list yet. Is there a way I can route mail that goes to the Google MX servers towards smtp2go or worst case scenario route all external mail via smtp2go?
See if this helps, instead of using a relay: https://www.howtoforge.com/community/threads/improve-deliverability-to-google-mail-users.86369/
