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