I ended up with mailu. What got me interested is their integration with traefik. It just worked. Not without 9 hours of finding out the right proxy settings, b

I ended up with mailu. What got me interested is their integration with traefik. It just worked. Not without 9 hours of finding out the right proxy settings, but know I'm attached to it like to IKEA furniture. On a more serious note, they showed an example of properly proxying a imap/smtp SSL connection. If you asked me before integrating it, I'd have thought it might be impossible, since SMTP has some STARTTLS negotation baked into protocol. I only knew how to proxy SSL in HTTP and never knew that bare TCP can be used to PROXY and terminate tls as well.