[infomax]

At my company we are using dockerized mailcow on a Hetzner VPS and it has taken us some time to have the IP whitelisted in all major e-mail providers.

The easiest to work with have been Microsoft and Yahoo. I still haven't found a way to whitelist our IP on centurylink.net, charter.net and att.com (please let me know if you have any ideas)

Some links that might be of help to others:

[1] https://sendersupport.olc.protection.outlook.com/snds/data.a...

[2] https://io.help.yahoo.com/contact/index?page=confirmation&lo...

[3] https://postmaster.google.com/u/0/dashboards#st=userReported...

[4] https://support.microsoft.com/en-us/supportrequestform/8ad56...

[5] https://www.mail-tester.com/

[sirnoggin]

Cannot upvote you enough for the yahoo link.