I'd like to add to that, before someone spends a lifetime searching for an
answer ...
"Solution: There isn't one. You cannot do real-time validation of mail
addresses. You must pick from a number of compromises."
The section goes on describing how many RFC-valid addresses are
undeliverable and on the opposite side of the coin, some RFC-invalid
addresses are perfectly deliverable.
"Our best advice for verifying a person's mail address is to have them enter
their address twice, just as you would when changing a password."
- Chris
> > I would like to know if anyone has or know any PHP code to verify if a
> > form entered e-mail address is valid?
> >
> > I would like that things like 4$%^%$@@.com.br could not be sent. I only
> > has to verify the syntax of it, the existance I believe should be harder
> > to verify but if it is possible I would be glad if anyone could point me
> > the way.
>
> This is taken from PHP Developers Cookbook. Don't ask me exactly what it
> does, because I don't know. I think I can grasp the basics of it though.
> It isn't fool proof tho.
>
>
> if (!eregi ("^([a-z0-9_]|\\-|\\.)+@(([a-z0-9_]|\\-)+\\.)+[a-z]{2,4}$",
> $users)) die ("Invalid email");
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