I'm hosting Mailcow in a cheap VPS, for both personal/family and system emails. Not something I'd necessarily recommend (it's overkill for your requirements anyway), but the initial setup and maintenance are not nearly as difficult as people will try to make you believe.
Before that I just used Gmail. You can point your sending application to smtp.gmail.com, STARTLS on port 587 or SSL on port 465, username is your email address, and a Gmail app password you create beforehand.
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