> they work on all mail servers. Wrong AFAIK. Unless certain mail providers have been patched recently without me noticing. > they're part of the spec for how

> they work on all mail servers. Wrong AFAIK. Unless certain mail providers have been patched recently without me noticing. > they're part of the spec for how you define an email address. Any server that doesn't support them is, by definition, broken. Might very well be true, I haven't checked. In that case I guess a number of people get their mail from broken mail servers so they have to deal with it anyway.