email exists: getmxrr

[alpine]

Being tired of bogus email-signups i'm thinking of doing a real-host check in some of my services.

Just to be clear, this isn't about checking valid email format (i check for that already) but rather a lookup function to verify a real and working host.

After reading back and forth in the manual i sticked on this example: http://no2.php.net/manual/en/function.getmxrr.php#64117

Seems to be running ok in most cases but i still cannot get a true result from it on a few norwegian hostnames i test it against.


Anyone that has already wandered these wods that can give me the path to an ok solution on this issue ?

[mainewoods]

this is what I use, dont know if it has a problem with norwegian sites:
[code]function isemailvalid($emailaddr) {
    //tests for valid email address
    if( (!preg_match('/(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/', $emailaddr)) &&
        (!preg_match('/^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})  (\]?)$/', $emailaddr)) ) {
        return FALSE;
    }
    list($mailusername, $mailDomain) = split("@", $emailaddr);
    if(checkdnsrr($mailDomain, 'MX') ) return TRUE;
    if(checkdnsrr($mailDomain, 'A') ) return TRUE;
    if(checkdnsrr($mailDomain, 'CNAME') ) return TRUE;
    return FALSE;
} [/code]

[alpine]

Thanks mainewoods,

It seems to have issues (false) on some hostnames, but if i check on all types (A, MX, NS, SOA, PTR, CNAME, AAAA, A6, SRV, NAPTR, ANY) it works on all tested adresses.

Seems that checkdnsrr perhaps is the way to settle with this for now.