Hello,
Steve Werby wrote:
> > Only thing left is whether or not
> > the user exists on the given mailserver. But for as far as I know
> > you can't automatically check that.
>
> Renze is correct. Unless you're checking local email addresses which you
> control, there's no way to check down to that level. And be happy there
> isn't. Otherwise the amount of spam you get right now will increase ten
> fold.
That is not accurate. Although it is not guaranteed that you can verify
if a given e-mail address is valid, there are many circunstances that
you can verify that an e-mail is invalid because the end SMTP server
rejects messages sent to them. For many circunstances this is good
enough, because it is better than not verifying an address at all.
My experience while developing the PHP Classes site is that despite
there is a notice in the subscribe page that the users need to supply a
valid reachable address or else they won't be able to choose their
password to login, still many try to supply invalid addresses in the
hope to fool the system. It's pointless for those people but still many
try.
With my PHP e-mail address validation class I reduced the ammount of
trash subscriptions that users managed to create in the early days of
the site. Although it is not a perfect solution, that was worth a lot.
Manuel Lemos
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