Actually, you can check the validity of the SMTP port to semi-validate the
domain. The name of the recipient would be harder, but again, through
your standard "user does not exist" error messages/codes, you could
tell if the domain is valid, but the user is not.
Checking to see if it's "syntactically correct" is trivial. Validating the
domain
is rather simple as well (check the retcode on a whois lookup.) Validating
the user would require interpretation of the return mail message(s).
Again, it's not "real-time" validation of anything except the
existance/validity
of the domain - not the user.
'Luck
-Szii
----- Original Message -----
From: "christopher hamilton" <[EMAIL PROTECTED]>
To: "Martin Skjoldebrand" <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>
Sent: Tuesday, April 24, 2001 1:39 PM
Subject: RE: [PHP] checking if e-mail address and syntax are valid
>
> 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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