I believe that you will be better served being more like uBlock Origin and less like traditional email alias services.
Once you implement the above, you could add a rich "rules" API and then you could do all sorts of interesting things:
- Forward emails as "spam" to the anondaddy database
- Don't receive emails marked as "spam" by at least X users using the anondaddy database.
- Queue all mail by [GROUP] and combine and send at the 1st of the month, etc.
- Queue all mail with [SALE] in the title and combine and send at the 1st of the month with subject line [Sales Newsletter].
- Remove all pictures from email before sending
You can seriously make some money off this. Think beyond traditional email aliases and think more about why people use email aliases to begin with - control over what gets in their inbox.
I'd implement what I suggest myself, but you'll quickly see that it's not trivial. I got to the point you're at now pretty quickly (weekend MVP), but implementing these other features becomes more trivial than doing it over an email (though it's not impossible by any means).
I agree it would be great to be able to create a per alias blacklist of senders who the alias will block emails from.
That way like you said you don't necessarily have to deactivate the entire alias if you receive a couple of emails from an unexpected source.
I'll definitely add this to my to do list, thank you.