function validEmail($email_adresse) {
		if (eregi('^[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+'.'@('.'([-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+\.)'.'([-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+$))', $email_adresse, $found)) {
			if (getmxrr($found[1], $mx_records)) {
				return $mx_records;
			}
		}
		return false;
}

this is php function to check an email about validity and existing mx records. :)

Probably belongs in PEAR not PHP, along with the URL-ize function mentioned in a bug report yesterday (#16642).  Now... Which module does it belong in?

but isn't it possible to add this function to the "standard repertoir" of php?

I think many people will use it and at the moment everyone writes his own "version" of this function.

everything's possible, but PEAR is part of the "standard repertoire",
so you should be happy. :)

you don't know how happy I am ;))

This belongs into PEAR (if at all).

There's already Mail/RFC822.php

It's wrong to only check the MX address as many domains don't have it (it's not a requirement). The CNAME has to be checked too.

a public mail server for a domain 
that does operate *without* MX records 
does not deserve to be taken serious IMHO

how do you implement fallback servers without
MX records?

and even if you say and A or CNAME record is
enough, how do you check that the machine with
that ip does really accept mail? by probing
the SMTP port all the time?

hartmut@www.six.de might be a legal address by
the CNAME rule, but i can assure you that mail
to that address will never reach me

so no MX -> no mail makes sense IMHO

I read some time ago a study done by a consultancy and the amount of domains without MX was terrible high (~20% of the domains audited). That's why I'm saying that. Of course all the "easy" e-mail verifications one can do, is only the half part as you can't check if the user really exists/is enabled or if the mail server is really there and accepting the emails for that domain (but we all knows that).

How can i check

how can i check version of database(say MySQL) thru PHP? Is there any function to check this in php

[10 May 8:54pm CEST] raman at e11online dot com 
Dear Raman,

You can use <? phpinfo(); ?> function to know about the version and other details.

PHP Programmer
INDIA