Nextcloud, Qbittorrent, Truenas and loads of other svcs take optional email credentials for sending alerts and other features (eg. password recovery for nextcloud).
What email providers do people usually use to make this process simple to set up? For example, Microsoft doesn’t allow basic auth anymore so it’s supposedly not possible to use via most of these setups, and some other services seem like they have a low inbox size (does this matter?)
I meant that the technology itself is reliable. And you can do self hosting just fine too, I’ve been doing it since 2010 or so, but running a local smarthost which sends messages via reputable SMTP provider works just fine too. Or even directly interacting with the SMTP provider from all the applications you’re running.