I've also done that and I've just recently added _ to the mix, which I think is particularly devious and wholeheartedly recommend.

These (the dot and underscore separators) are a great solution, because when the spam-happy-marketroids try to get the webdevs to intentionally implement broken email address validation, they can point out all the corporate email addresses which are by-policy of the form "firstname.lastname@domain.tld"…

Yeah, so much for RFC2822. Oh well, apparently, some spammers are clever enough to grep the emails with "+" and throw away the obvious additional portion.

The author of that rfc should be shoot. Of course nobody obeys a standard which requires you to handle comments in email addresses.

I'm not sure I understand. Which part of that RFC are you responding to?