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 easi

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.aspx https://sendersupport.olc.protection.outlook.com/snds/data.a... [2] https://io.help.yahoo.com/contact/index?page=confirmation&locale=en_US&key=1f5487f664e74b6483665dc3e84c1fc9 https://io.help.yahoo.com/contact/index?page=confirmation&lo... [3] https://postmaster.google.com/u/0/dashboards#st=userReportedSpamRate&dr=7 https://postmaster.google.com/u/0/dashboards#st=userReported... [4] https://support.microsoft.com/en-us/supportrequestform/8ad563e3-288e-2a61-8122-3ba03d6b8d75 https://support.microsoft.com/en-us/supportrequestform/8ad56... [5] https://www.mail-tester.com/ https://www.mail-tester.com/