baspax1

baspax1

You’re welcome. I’m glad you were able to solve your problems.

BTW: if you re-think about your situation at Contabo one day, I can highly recommend the new Hetzner ARM64 tariffs which offer very good value for the money. For example:

I have this one since 4 weeks and my Mailcow (and several other services) are running without any problems. I never had any downtime or other trouble and my IP is absolutely clean. I can even deliver directly to Microsoft which is - honestly speaking - a miracle. ;-)

I know Hetzner cost two bucks more, but it’s really worth the price. You would never want again a low-cost provider like Contabo.

Good luck and all the best…

baspax1

In fact smtp2go is really easy to setup. First you open an account there (free plan includes up to 1000 mails per month).
You need to create an SMTP user and you need to setup your domains as “sender domains”. For that you need access to your domain DNS entries, because you have to create some CNAME entries. Please follow the guide on smtp2go.com.

After you save the details in Mailcow under System -> Configuration -> Routing -> Transport maps.
It should look like this:

If you have lots of trouble to get your mails delivered, you could try to place a wildcard under “destination” so that ALL outgoing mails will be relayed to smtp2go. Otherwise you can start to use the relay for single domains like gmail.com, outlook.com etc.

You can find some more details regarding relayhost here:

https://docs.mailcow.email/en/manual-guides/Postfix/u_e-postfix-relayhost/?h=transport

Good luck!

baspax1
DNS changes take some time if not hours to be replicated. Also Google says that reputation score is changed slowly.

https://docs.mailcow.email/prerequisite/prerequisite-dns/#dkim-spf-and-dmarc

Also try the Gmail Troubleshooter

Did you follow the link in that SMTP message? And registered your domain with the Postmaster Tools to gmail?