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> People have learned that you can simply strip that part out of the address... it's in the standard.

I'll take "Common RFC 821/2321/5321 myths" for $300, please.

RFC 5322 and RFC 5321 are very emphatic that the local part has no semantics whatsoever except those given to it by the MTA. There is no semantics for what "+" means in the standards.

Using Postmail's virtual aliases and a nice web interface to manage them, I create a random virtual alias (h9jle20gavs32@domain.tld) associated with a site name for every place I have to input an email address, it makes spam tracking pretty simple.

I would love to see a spam-shame site made by people who do this, outing the companies who sell or trade our email addresses.

Maybe + as a whitelist rather than a blacklist.

I'm still surprised that so few people know about www.spamgourmet.com it's been around for 15+ years and offers the exact feature you're talking about. You don't even have to create the alias, it will be created on first use.