Postfix. It's the only software package that I use where I am consistently sure that any issue I come up with is me making a mistake in configuration or me not

Postfix. It's the only software package that I use where I am consistently sure that any issue I come up with is me making a mistake in configuration or me not having read the documentation closely enough. It's stable, it has good error messages, it supports all the different ways to send email. And it's documentation is just really well and precisely written. It's just really good. It's not that I think that Postfix is 10x better than other email software that I use - it's 10 times better than any other kind of software I have used in the 20 years that this has been a relevant question. Thank you Wietse, thank you Viktor, thank you Ralf and thank you Kyle.