@lschuermann @antekone I've been running my own mail server for about 15yr now, and I'm finding that sending to G,MS etc servers is actually working very well nowadays, but you do have to ensure you're config is rock solid including rDNS, IPv6, SPF, DKIM and DMARC. Use a tool like mxtoolbox.com to ensure your server's IP is not blacklisted anywhere, and a tool such as mail-tester.com to analyse and report on the email your server sends.
@aran @antekone Yeah, I'm running mine for a few years now and with the big providers (which *know* how to do Email correctly but sometimes deliberately decide to fuck things up) I never had an issue. Its medium to large company's sysadmins which apparently don't know that services other than their domain and the big webmail providers exist. Even worse, I've got my MX on a subdomain (with is.currently.online, that's a must :D).
ODing in the fediverse!