src/Autodiscover.php
public function trySubdomain()
    {
        $url = 'https://autodiscover.' . $this->tld . self::AUTODISCOVER_PATH;
        return ($this->tryViaUrl($url)
            ? self::AUTODISCOVERED_VIA_SUBDOMAIN
            : false);
    }
public function trySubdomain()
    {
        $url = 'https://autodiscover.' . $this->tld . self::AUTODISCOVER_PATH;
        return ($this->tryViaUrl($url)
            ? self::AUTODISCOVERED_VIA_SUBDOMAIN
            : false);
    }
public function trySubdomain ( ) { $ url = 'https://autodiscover.' . $ this -> tld . self :: AUTODISCOVER_PATH ; return ( $ this -> tryViaUrl ( $ url ) ? self :: AUTODISCOVERED_VIA_SUBDOMAIN : false ) ; }
Perform an NTLM authenticated HTTPS POST to the 'autodiscover'
subdomain of the email address' TLD.

@return integer|boolean
One of the AUTODISCOVERED_VIA_* constants or false on failure.
Perform an NTLM authenticated HTTPS POST to the autodiscover subdomain of the email address TLD .