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> The tag feature is not always available because app developers frequently don’t allow the plus characte

Should we stop using a feature because some buggy apps don’t support it?

This is why, on my semi-personal (<10 users) email server I process several different characters as tagging characters: dot, dash, underscore, and plus IIRC.

I use a subdomain as catch-all; *@something.example.com all goes to one folder. That way it's impossible for the spammers to know that this is a "sorted" e-mail address since lots of people have e-mail addresses under a subdomain and it's not trivial to filter out like myrealidentity+youareaspammer@example.com turning into myrealidentity@example.com.

Other users on my setup can use it, they just have to pick a different "something" if they want to use the same example.com as me.

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