How are people sending emails from their self hosted apps? I Thought MailSender would be good but i guess not. Im about to try SendPulse now. Why isnt there a service that doesnt care what you do with your emails as long as you only sending max a few emails a day?
.test internal domain, own postfix SMTP+dovecot IMAP server.
The IMAP server is accessible from WAN via IMAPS (HAproxy+SSL/letsencrypt certificate).
As per securing against brute force attacks:
Dovecot has a listener process configured to talk the HAproxy’s specific PROXY protocol which passes the original client IP to Dovecot, so the latter can apply its own authentication penalty algorithm
Crowdsec is installed with the HAproxy plugin, so client IPs can also be banned after authentication errors, albeit I’m not sure this works with HAproxy’s PROXY protocol