I would love to run my mail server self-hosted at home. I have a small N100 box that I would like to dedicate for this purpose.

Needs

• capability to handle a handful of domains
• each domain has at least one user (no more than a handful each)
• the ability for users to have multiple aliases
• relatively small amounts of email per day total (mostly incoming)

Concerns / Possible Mitigations:

• residential IP won’t work with SMTP
• I have a Vultr VPS I could use as a relay between the world and me (IP reports as clean on blacklist checkers [both IPv4 and IPv6])

Questions:

• Could I set up WireGuard between the home server and VPS then have that handle sending out the email?
• What software stack would I need? Would this be something like postfix to postfix or..?