The reason spammers don't remove the + automatically, is because their goal isn't to deliver spam, it's to get the right people to read the spam. The people wh

The reason spammers don't remove the + automatically, is because their goal isn't to deliver spam, it's to get the right people to read the spam. The people who use the + trick are exactly the set of people who would never read spam email, and they're also likely to use the "report spam" feature and lower the deliverability of the rest of their spam.