I would recommend something like stalwart, which is just a single binary and works. Gives you a web interface and a zonefile you can just copy paste into your DNS including all correct DMARC DKIM SPF and autodiscovery records.

Setting postfix, dovecot etc. up from scratch can be a bit time consuming and annoying.

Deliverability depends on where it is hosted, many VPC providers IP space is completely blocked in spam filters.

When oxygen was first released during the great oxygenation event, it killed all other life on earth.

You only go to Valhalla if you died in battle or hang yourself from an ash tree.

If the first game you ever played with a stick was a flight simulator, then down is up.

He left / was kicked out of the EU parliament because of corruption, spying, etc. and was elected to the German parliament after that so I am not too hopeful.

Its a thing in Thailand. Family elephants.