I'm wondering how this site http://verify-email.org/ is checking whether the email actually belongs to some domain or some smtp.
i have tried this nslookup .
<?php
// Function to check whether a given hostName is a valid email
// domain address.
function myCheckDNSRR($hostName, $recType = '')
{
if(!empty($hostName)) {
if( $recType == '' ) $recType = "MX";
exec("nslookup -type=$recType $hostName", $result);
// check each line to find the one that starts with the host
// name. If it exists then the function succeeded.
foreach ($result as $line) {
if(eregi("^$hostName",$line)) {
return true;
}
}
// otherwise there was no mail handler for the domain
return false;
}
return false;
}
// If you are running this test on a Windows machine, you'll need to
// uncomment the next line and comment out the checkdnsrr call:
//if (myCheckDNSRR("joemarini.com","MX"))
if (checkdnsrr("dilip","MX")) // previously they had joemarini.com","MX"
echo "yup - valid email!";
else
echo "nope - invalid email!";
?>
i got this code from sitepoint which is not upto the level of http://verify-email.org/.
my question: is there any modification required in the code to accompolish the functionality of this website http://verify-email.org/
Related
I am trying to code a registration form where I am validating the email used to sign up.
In a nutshell, I want to ensure that the email ID used to register, is a company domain, and not something like gmail or yahoo.
I have the following code to check IF an email is a part of the given domain, how can I modify this to check that it ISNT in a given list of domains? (eg : gmail.com, yahoo.com,hotmail.com, etc).
return (bool) preg_match('/^([a-z0-9\+\_\-\.]+)#([a-z0-9\+\_\-\.]{2,})(\.[a-z]{2,4})$/i', $domain);
Im thinking it should be along these lines, but not entirely sure :
function validate($email)
{
$error = 0;
$domains = array('gmail.com','yahoo.com','hotmail.com');
foreach($domains as $key=>$value)
{
if(preg_match('/^([a-z0-9\+\_\-\.]+)#([a-z0-9\+\_\-\.]{2,})(\.[a-z]{2,4})$/i', $value)
{
$error=1;
}
}
if($error==0)
return true;
else
return false;
EDIT : I tried all the answers given here, the form still submits without a problem no matter what domain I use! (Even a non email seems to work!)
This is how I'm calling the function -
if(isset($_POST['clients_register']))
{
//Must contain only letters and numbers
if(!preg_match('/^[a-zA-Z0-9]$/', $_POST['name']))
{
$error[]='The username does not match the requirements';
}
//Password validation: must contain at least 1 letter and number. Allows characters !##$% and be 8-15 characters
if(!preg_match('/^(?=.*\d)(?=.*[A-Za-z])[0-9A-Za-z!##$%]{8,15}$/', $_POST['password']))
{
$error[]='The password does not match the requirements';
}
//Email validation
if (validateEmail($_POST['email'])==false)
{
$error[]='Invalid E-mail';
}
//Output error in array as each line
if ( count($error) > 0)
{
foreach ($error as $output) {
echo "{$output} <br>";
}
} else {
//Syntax for SQL Insert into table and Redirect user to confirmation page
}
}
Problem is, no matter what I do, the user gets redirected to the confirmation page (Even with a name made of numbers and an email like "table".
You should do that in a separate step. First check if the e-mailaddress has a valid syntax. Than extract the domain and see if it's not in your blacklist.
function validate($email)
{
if (!preg_match('/^([a-z0-9\+\_\-\.]+)#([a-z0-9\+\_\-\.]{2,})(\.[a-z]{2,4})$/i', $email)) return false;
$domains = array('gmail.com','yahoo.com','hotmail.com');
list(, $email_domain) = explode('#', $email, 2);
return !in_array($email_domain, $domains);
}
function validateEmail($email)
{
// Etc, just an array of the blacklisted domains
$blacklistDomains = ['gmail.com', 'yahoo.com', 'hotmail.com', 'googlemail.com'];
// Check if the email is valid
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
return false;
}
// Split the email after the '#' to get the domain
$emailParts = explode('#', $email);
if (in_array(end($emailParts), $blacklistDomains)) {
return false;
}
return true;
}
You'll need a pretty big list of domains.
PHP
// Suposing that $email is a valid email
function validate($email) {
$invalidDomains = array('gmail.com','yahoo.com','hotmail.com');
$parts = explode('#',$email);
$domain = $parts[1];
if(!in_array($domain,$invalidDomains)) return true;
return false;
}
Let me know if it's useful.
I am asking for an email address through a form in my website. I want to validate the domain so that I can prevent fake entries I am getting right now. I am using the following code, but it dose not seem to work :
function myCheckDNSRR($hostName, $recType = '')
{
if(!empty($hostName)) {
if( $recType == '' ) $recType = "MX";
exec("nslookup -type=$recType $hostName", $result);
// check each line to find the one that starts with the host
// name. If it exists then the function succeeded.
foreach ($result as $line) {
if(eregi("^$hostName",$line)) {
echo "valid email";
}
}
// otherwise there was no mail handler for the domain
echo "invalid email";
}
echo "invalid EMAIL";
}
I am new to this and used this code from here
Please guide me. Thanks.
I guess you can simply ping like this.
function myCheckDNSRR($email_address)
{
if(!empty($email_address)) {
$hostName=strstr($email_address, '#');
$hostName=str_replace("#","www.",$hostName);
exec("ping " . $hostName, $output, $result);
if ($result == 0){
echo "valid email";
}
else{
echo "invalid email";
}
}
}
call it like
echo myCheckDNSRR("sample#gmail.com");
Use a validation lib like https://docs.zendframework.com/zend-validator/validators/email-address/
$validator = new Zend\Validator\EmailAddress();
if ($validator->isValid($email)) {
// email appears to be valid
} else {
// email is invalid; print the reasons
foreach ($validator->getMessages() as $message) {
echo "$message\n";
}
}
Create a table in your DB for storing an email link code. When someone registers, mark the user as unactivated until he clicks the link in the email. This way, you know it's real, and can activate the user.
I am trying to code a registration form where I am validating the email used to sign up.
In a nutshell, I want to ensure that the email ID used to register, is a company domain, and not something like gmail or yahoo.
I have the following code to check IF an email is a part of the given domain, how can I modify this to check that it ISNT in a given list of domains? (eg : gmail.com, yahoo.com,hotmail.com, etc).
return (bool) preg_match('/^([a-z0-9\+\_\-\.]+)#([a-z0-9\+\_\-\.]{2,})(\.[a-z]{2,4})$/i', $domain);
Im thinking it should be along these lines, but not entirely sure :
function validate($email)
{
$error = 0;
$domains = array('gmail.com','yahoo.com','hotmail.com');
foreach($domains as $key=>$value)
{
if(preg_match('/^([a-z0-9\+\_\-\.]+)#([a-z0-9\+\_\-\.]{2,})(\.[a-z]{2,4})$/i', $value)
{
$error=1;
}
}
if($error==0)
return true;
else
return false;
EDIT : I tried all the answers given here, the form still submits without a problem no matter what domain I use! (Even a non email seems to work!)
This is how I'm calling the function -
if(isset($_POST['clients_register']))
{
//Must contain only letters and numbers
if(!preg_match('/^[a-zA-Z0-9]$/', $_POST['name']))
{
$error[]='The username does not match the requirements';
}
//Password validation: must contain at least 1 letter and number. Allows characters !##$% and be 8-15 characters
if(!preg_match('/^(?=.*\d)(?=.*[A-Za-z])[0-9A-Za-z!##$%]{8,15}$/', $_POST['password']))
{
$error[]='The password does not match the requirements';
}
//Email validation
if (validateEmail($_POST['email'])==false)
{
$error[]='Invalid E-mail';
}
//Output error in array as each line
if ( count($error) > 0)
{
foreach ($error as $output) {
echo "{$output} <br>";
}
} else {
//Syntax for SQL Insert into table and Redirect user to confirmation page
}
}
Problem is, no matter what I do, the user gets redirected to the confirmation page (Even with a name made of numbers and an email like "table".
You should do that in a separate step. First check if the e-mailaddress has a valid syntax. Than extract the domain and see if it's not in your blacklist.
function validate($email)
{
if (!preg_match('/^([a-z0-9\+\_\-\.]+)#([a-z0-9\+\_\-\.]{2,})(\.[a-z]{2,4})$/i', $email)) return false;
$domains = array('gmail.com','yahoo.com','hotmail.com');
list(, $email_domain) = explode('#', $email, 2);
return !in_array($email_domain, $domains);
}
function validateEmail($email)
{
// Etc, just an array of the blacklisted domains
$blacklistDomains = ['gmail.com', 'yahoo.com', 'hotmail.com', 'googlemail.com'];
// Check if the email is valid
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
return false;
}
// Split the email after the '#' to get the domain
$emailParts = explode('#', $email);
if (in_array(end($emailParts), $blacklistDomains)) {
return false;
}
return true;
}
You'll need a pretty big list of domains.
PHP
// Suposing that $email is a valid email
function validate($email) {
$invalidDomains = array('gmail.com','yahoo.com','hotmail.com');
$parts = explode('#',$email);
$domain = $parts[1];
if(!in_array($domain,$invalidDomains)) return true;
return false;
}
Let me know if it's useful.
I have the following function that checks whether an eMail is valid:
function validate_email ($getemail, $type)
{
$email = $getemail;
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
$chkdomain = explode("#", $email);
$domain = $chkdomain[1];
switch ($type) :
case 1: //FOR USERS
if ($domain == "oxfordmontessori.com" || $domain == "student.com" || $domain == "vendor.com")
return 'Not Valid';
else
return TRUE;
endswitch
;
} else {
return FALSE;
}
}
I am calling function in this way.
var_dump($email);
$response = validate_email($email, '1');
var_dump($response);
if ($response == FALSE) {
$error = "Incorrect Email-Id";
} elseif ($response == 'Not Valid') {
$error = "Email domain is not valid for user.";
}
var_dump($response);
The code has the following issues
Function is that not much restrict with email validation like sunrise#o.com and 'sunrise#o.c' both are consider as valid email id's.
If function return TRUE than also I get "Email domain is not valid for user."
One issue is still their that is on return of TRUE it gives me error Email domain is not valid for user.
its not working because if the domain is set to oxfordmontessori.com student.com or vendor.com, it returns "Not Valid", so #a.com and #b.com will return true. Unless your system is designed to stop people from using those specific domains.
You should probably have either an external variable to store the error, or a pointer in the arguments, rather than returning multiple data types from the function. Either a true or false, maybe an integer, but not a mix of true, false, and string. I think strings (when checked against boolean operators) return true every time.
you can also use html5 email inputs for validation.
Validation is mostly done by regex functions like
preg_match()
Here is an example of using regular expressions for validating email addresses
I know email validation is one of those things which is not the funniest thing on the block. I'm starting up a website and i want to limit my audience to only the people in my college and i also want a preferred email address for my user. So this is a two part question.
Is there a really solid php function out there for email validation?
Can I validate an email from a specific domain. I dont want to just check if the domain exists, because I know www.mycollege.edu exists already. Is there really anyway to validate that the user has a valid #mycollege.edu web address?
This is what I use:
function check_email_address($email) {
// First, we check that there's one # symbol, and that the lengths are right
if (!preg_match("/^[^#]{1,64}#[^#]{1,255}$/", $email)) {
// Email invalid because wrong number of characters in one section, or wrong number of # symbols.
return false;
}
// Split it into sections to make life easier
$email_array = explode("#", $email);
$local_array = explode(".", $email_array[0]);
for ($i = 0; $i < sizeof($local_array); $i++) {
if (!preg_match("/^(([A-Za-z0-9!#$%&'*+\/=?^_`{|}~-][A-Za-z0-9!#$%&'*+\/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$/", $local_array[$i])) {
return false;
}
}
if (!preg_match("/^\[?[0-9\.]+\]?$/", $email_array[1])) { // Check if domain is IP. If not, it should be valid domain name
$domain_array = explode(".", $email_array[1]);
if (sizeof($domain_array) < 2) {
return false; // Not enough parts to domain
}
for ($i = 0; $i < sizeof($domain_array); $i++) {
if (!preg_match("/^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$/", $domain_array[$i])) {
return false;
}
}
}
return true;
}
EDIT Replaced depreciated ereg with preg_match for PHP 5.3 compliance
If you really want to make sure its valid make your signup form send them an email with a URL link in that they have to click to validate.
This way not only do you know the address is valid (because the received the email), but you also know the owner of the account has signed up (unless someone else knows his login details).
To make sure it ends correctly you could use explode() on the '#' and check the second part.
$arr = explode('#', $email_address);
if ($arr[1] == 'mycollege.edu')
{
// Then it's from your college
}
PHP also has it's own way of validating email addresses using filter_var: http://www.w3schools.com/php/filter_validate_email.asp
This should work:
if (preg_match('/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])#mycollege.edu$/', $email)) {
// Valid
}
Read here
http://ru2.php.net/manual/en/book.filter.php
Or in short
var_dump(filter_var('bob#example.com', FILTER_VALIDATE_EMAIL));
this might be a better solution. many answered already, eventhough its little different.
$email = "info#stakoverflow.com";
if (!filter_var($email, FILTER_VALIDATE_EMAIL) === false) {
echo $email ." is a valid email address";
} else {
echo $email ." is not a valid email address";
}
I hope this one has simple to use.
for any e-mail
([a-zA-Z0-9_-]+)(\#)([a-zA-Z0-9_-]+)(\.)([a-zA-Z0-9]{2,4})(\.[a-zA-Z0-9]{2,4})?
for php preg_match function
/([a-zA-Z0-9_-]+)(\#)([a-zA-Z0-9_-]+)(\.)([a-zA-Z0-9]{2,4})(\.[a-zA-Z0-9]{2,4})?/i
for #mycollege.edu
^([a-zA-Z0-9_-]+)(#mycollege.edu)$
for php preg_match function
/^([a-zA-Z0-9_-]+)(#mycollege.edu)$/i
PHP CODE
<?php
$email = 'tahir_aS-adov#mycollege.edu';
preg_match('/^([a-zA-Z0-9_-]+)(#mycollege.edu)$/i', $email, $matches);
if ($matches) {
echo "Matched";
} else {
echo "Not Matched";
}
var_dump($matches);
A simple function using filter_var in php
<?php
function email_validation($email) {
if (!filter_var($email, FILTER_VALIDATE_EMAIL) === false) {
echo("$email is a valid email address");
} else {
echo("$email is not a valid email address");
}
}
//Test
email_validation('johnson123');
?>