Magento hostname validation errors

When i tried to register with an email on magento store that I am developing I came across with errors that i havent seen before that says:

"Email" is not a valid hostname

does not appear to be a valid local network name

appears to be a DNS hostname but cannot match TLD against known list magento

When I did my research I foundout that these errors comes are caused by the Zend hostname validation.

Is it possible to resolve these or there's no solution at all

Solution

I encountered same error :

"Email" is not a valid hostname.
'example.example' appears to be a DNS hostname but cannot match TLD against known list
'example.example' appears to be a local network name but local network names are not allowed

From Magento 1, it appears that Zend is using a hardcoded list of Tlds :

     /**
     * Array of valid top-level-domains
     *
     * @see ftp://data.iana.org/TLD/tlds-alpha-by-domain.txt  List of all TLDs by domain
     * @see http://www.iana.org/domains/root/db/ Official list of supported TLDs
     * @var array
     */
    protected $_validTlds = array(
        'ac', 'ad', 'ae', 'aero', 'af', 'ag', 'ai', 'al', 'am', 'an', 'ao', 'aq', 'ar', 'arpa',
        [...]
        'ye', 'yt', 'yu', 'za', 'zm', 'zw'
    );

So, there are some options :

Option 1 : updating this list from zend github
Option 2 : removing the domain validation
Option 3 : From @Aleksey Razbakov comment, we can only check the MX record : https://framework.zend.com/manual/1.12/en/zend.validate.set.html#zend.validate.set.email_address.checkacceptance

For Option 2 we can perform a safe-upgrade of the following file, or see option 3 to add $validator->getHostnameValidator()->setValidateTld(false);, copying it from :

/lib/Zend/Validate/Hostname.php

to :

/app/code/local/Zend/Validate/Hostname.php

Then look for this block of code, and just comment the three lines :

if (!in_array($this->_tld, $this->_validTlds)) {
  // $this->_error(self::UNKNOWN_TLD);
  // $status = false;
  // break;
}

For Option 3 we can perform a safe-upgrade of the following file, copying it from :

app/code/core/Mage/Eav/Model/Attribute/Data/Abstract.php

to :

/app/code/local/Mage/Eav/Model/Attribute/Data/Abstract.php

Then replace this code :

$validator = new Zend_Validate_EmailAddress();

by :

// 1. we check mx record
$validator = new Zend_Validate_EmailAddress(
    array(
      'allow' => Zend_Validate_Hostname::ALLOW_DNS,
      'mx'    => true
    )
);
// 2. we remove TLD validation :
$validator->getHostnameValidator()->setValidateTld(false);

Do not forget to look for every call of the Zend_Validate_EmailAddress class that can be used in community or custom extensions (e.g : onestepcheckout).