Postfix subaddressing (with PostgreSQL)
I have so many accounts for various web-based solutions, I barely can remember a few. And they send emails. So many that it’s sometimes hard to not loose the overview in my mailbox.
When you run your own mail server, it’s easy to set up a dynamic aliases for your mailserver based on a regular expression pattern that allows to e.g. have a own email address for each service you register. The emails sent to that alias go into special mailboxes instead of your default INBOX folder. This is called “subaddressing”, sometimes also referred to as “plus addressing” or “tagged addressing”.