If you ask me for a contact email I will tell you something like jaksmit5@basilikum.monster. Editing the FROM field allows me to write an email to you.

If you ever start sending me spam I can just block that address. Especially helpful with companies.

You can also use it for sorting emails.

It's honestly a basic feature of an email client. Even if you don't have your own domain stuff like the plus sign for aliases exists with many providers (or at least with gmail).

Just noting that the thundermail email service (not to be confused for the app) - allows setting up a limited number of custom domains and subdomains with catch all aliases - so I could move my s.hypertekst.net domain over.

https://support.tb.pro/hc/en-us/articles/51338950680467-How-...