Check for existence of mail address

[webdev@xxxxxxxxxxxxx]

Hi, folks,

I'm wondering how to checking existence of a given
mail address like foo@xxxxxxx .

At 1st I tried:

  if f (filter_var ($maddr, FILTER_VALIDATE_EMAIL) === false) {
    /* some sort of error handling code here */
  }

where $maddr is the address to be checked.
But this checks only syntax.. :-(

Is there any other function which checks whether this
address really exists?

And, of course, I want to avoid sending a test mail just
for checking :-)

Many THX in advance for suggestions, pointers...

Rolf
-- 
Dipl.phys. Rudolf Otto BlÃttner,
D 91074 Herzogenaurach, Germany.

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