I would not bother to host email service for one user. You have to keep up with all updates and vulnerabilities on daily basis.
You don't have enough volume as well and it increases your chances to be marked as a spam. Self-hosting is quite pricey because you have to care about your IP reputation (and you can't really gain any reputation if you send couple of emails). You can't use cheap VPS providers because most likely IPs from them will be marked as increased chances of spam.
If you really want to go with the self-hosting route, configure your server to accept email but when you send, send it through large email providers like sendgrid/amazon ses or so.
You don't have enough volume as well and it increases your chances to be marked as a spam. Self-hosting is quite pricey because you have to care about your IP reputation (and you can't really gain any reputation if you send couple of emails). You can't use cheap VPS providers because most likely IPs from them will be marked as increased chances of spam.
If you really want to go with the self-hosting route, configure your server to accept email but when you send, send it through large email providers like sendgrid/amazon ses or so.