How to check if the email address exist?

Question

Recently I notice that some people register with a false email like "blablabla@blablabla.bla"

i want to check if the email entered in the registration form is valid and exist

and thank you ..

i don' want to send anything :/ when i search i find some thing called Mx record how to use it ?

Send an email to the address, if you get an email back saying "huh?" it's a correct email address. It's like phone numbers, or post addresses, how do you know they're valid? _you don't_ (unless you interact with it) — Halcyon, Nov 15 '13 at 12:52
@MartinJames — That will only tell you if the domain exists. — Quentin, Nov 15 '13 at 12:53
Frits above in the first comment gave you the answer. You cannot know if an email exists without sending an email to it and getting a reply in one form or another. — Allan S. Hansen, Nov 15 '13 at 12:59

Wayne Whitty · Answer 1 · 2013-11-15T13:04:17.203

Send the email address in question an email with a link back to your website. This link should contain a unique token that is tied to the user account in question (or, you can simply add the user's ID to the URL as well, so that you know what account to validate the token against). When the user clicks on it, your site should validate the token. If the token is valid, your application can assume that the email address in question exists and that it belongs to the user. Example link:

http://mywebsite.com/validate.php?user=2934&validate=37dbhjibh8879uhe98098ushy89d3dd3

Where 2934 is the user ID and 37dbhjibh8879uhe98098ushy89d3dd3 is the token that you sent out and need to validate.

When the user is registering, you can check if the email conforms to RFC 822 grammar by using:

if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
     //Valid email!
}

i don' want to send anything :/ when i search i find some thing called Mx record how to use it — user2993931, Nov 15 '13 at 13:08
@user2993931 You can't see if the email address exists. The domain could be correct but the email mightn't be. — Wayne Whitty, Nov 15 '13 at 13:10

score 0 · Answer 2 · answered Nov 15 '13 at 12:58

0

You can if the the domain of the email address entered has a valid MX record using the below code:

checkdnsrr(preg_replace('/^[^@]+@/', '', $emailAddress), 'MX');

But checkdnsrr() doesn't work on Windows platforms

answered Nov 15 '13 at 12:58

Ramesh

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How to check if the email address exist?

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