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And then the spammers (or other illegitimate source) just add this to their processing… ^([^@+]+)\+[^@]*(@.*)$

• epistasis 10mo ago
  The use case here is using a unique email address to help verify the sender of the email, it's not connected to spam usage.
  • cheschire 10mo ago
    So you’re suggesting the sender use the + modifier on the from address?
    • epistasis 10mo ago
      Here's the suggestion: >Use <service>@<yourdomain> as your email address when signing up, and check the To header when receiving emails. The user of the webservice specifies a unique email per webservice; knowledge of that unique email address serves as a hint that the email came from someone that has discovered that email address, i.e. the webservice itself.
      • cheschire 10mo ago
        Right, so 99% of the time that’s a spammer that is going to use that discovered email. I updated my message to specify other illegitimate sources to cover that less than 1%