Scenario:
I have a contact form on my web app, it gets alot of spam.
I am validating the format of email addresses loosely i.e. ^.+@.+\..+$
I am using a spam filtering service (defensio) but the spam scores returned are overlapping with valid messages. At a threshold of 0.4 some spam gets through and some customer's questions are wrongly thrown in a log and an error displayed.
Spam mesajların tüm sahte e-posta adresleri örneğin kullanın zxmzxm@ywduasm.com
ABD, mysql, Dedicated PHP5 Linux sunucu (saklı değil) olmayan spam mesajları, e-posta, sadece istenmeyen günlüğü.
Proposal:
Use php's checkdnsrr(preg_replace(/^.+?@/, '', $_POST['email']), 'MX')
to check the email domain resolves to a valid address, log to file, then redirect with an error for messages that don't resolve, proceed to the spam filter service as before for addresses that do resolve according to checkdnsrr()
.
Okudum (ve ben kendimi bu konuda şüpheci) uzaktan aramalarını kadar doğrulama bu tür asla terk gerektiğini, ama neden?
Aside from connectivity issues, where i will have bigger problems than a contact form anyway, is checkdnsrr going to encounter false positives/negatives?
Would there be some address types that wont resolve? gov addresses? ip email addresses?
Do i need to escape the hostname i pass to checkdnsrr()?
Solution: A combination of all three answers (wish i could accept more than one as a compound answer).
Ben kullanıyorum:
$email_domain = preg_replace('/^.+?@/', '', $email).'.';
if(!checkdnsrr($email_domain, 'MX') && !checkdnsrr($email_domain, 'A')){
//validation error
}
All spam is being logged and rotated. With a view to upgrading to a job queue at a later date.
Bazı yorumlar doğrulamak için kullanıcı için posta sunucusu hakkında soran, ben bu çok fazla trafik olacak ve benim sunucu yasaklandı alabilirsiniz ya da bir şekilde belaya hissettirdi, ve bu sadece ediliyordu e-postaların en kesip etmektir edildi geri nedeniyle geçersiz sunucu adresleri gidiyordu.
http://en.wikipedia.org/wiki/Fqdn and
RFC2821
The lookup first attempts to locate an MX record associated with the name.
If a CNAME record is found instead, the resulting name is processed as if
it were the initial name.
If no MX records are found, but an A RR is found, the A RR is treated as
if it was associated with an implicit MX RR, with a preference of 0,
pointing to that host. If one or more MX RRs are found for a given
name, SMTP systems MUST NOT utilize any A RRs associated with that
name unless they are located using the MX RRs; the "implicit MX" rule
above applies only if there are no MX records present. If MX records
are present, but none of them are usable, this situation MUST be
reported as an error.
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