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Yep Lemmy uses SMTP and in my experience most self-hostable platforms do as well. You can see in the Lemmy config documents how it gets set up: https://join-lemmy.org/docs/administration/configuration.html.
@Asudox my mastodon connects with smtp to a locally running sendmail which then forwards the messages signed with dkim
Is running a SMTP server a pain in the ass? Like hard to maintain?
Yes, it is.
I’ve been running my own mail server for decades now (a quite odd hobby, I know) and that’s not to be recommended for anyone who doesn’t have a particular interest in e-mail. SMTP is from the early 1980s with roots in the 1970s and has had layer upon layer bolted on since then. It’s a fantastic mess.