Ask HN: Managing Multiple Email Addresses

In general, on the incoming side you have two options: Have all the mail sent to one server (pointing all MX records to the same place), or using something to sync messages in place from a remote (in cases where you want to keep the primary mailbox on another server for whatever reason).

Similarly on the SMTP: You can send directly yourself or use separate relays for individual domains.

Then I guess it's up to you if you want to keep inboxes compartmentantalized and duplicated (internal forwarding) or suck them all into one place directly (aliasing).

Reasonable mail clients will allow you to add multiple sender aliases and map them when you reply.

You can set up e.g. dovecot and postfix yourself or use one of the many appliance projects out there (docker-mailserver, mailinabox, mailu, mailcow, I'm sure there are others). Or if self-hosting is not an option, providers should slso support adding domains to your account (usually for a pretty penny).

Update: I have gone with zoho mail

Cloudflare can manage inbound addresses. Big providers like Gmail and Proton can manage outbound “identities”.