eMail verification and RFC

Yeah! Today I got another spam from prefix+suffix@gmail.com. And I was able to track the spemmer's source again. The mail is already blacklisted. Too bad that 95% of the web services hired students to create their eMail address verification (possibly the whole security !). There are (too) many pages where I cannot register eMail address that has a +. Dear WEB DEVELOPERS - it is not that difficult to read the RFC! Really! And mail address pattern [a-zA-Z0-9.]\@[a-zA-Z0-9.] is INVALID! Really!