What do you use for outgoing smtp?

https://eviltoast.org/post/2431

What do you use for outgoing smtp? - eviltoast

One of the things I don’t really want to self host is a mail server, especially for outbound mail. Currently I’m using a Gmail account, but I want to change that. What do you all use for things like notifications sent through smtp? I’m leaning towards AWS SES since it’s cheap, but I know there are some other options like mailgun and sendgrid.

There's a proton bridge docker container out there that I'm planning to standup this weekend for SMTP use inside my home lab.
I'd be interested in hearing how that goes. I don't currently use protonmail, but need to look at it again sometime.