What about ISP's using outgoing mailservers without a MX record? I know of a lot of these isp's, would the email then be dropped?
// Mattias -----Original Message----- From: Jake Vickers [mailto:[EMAIL PROTECTED] Sent: den 15 maj 2006 13:32 To: [email protected] Subject: Re: [qmailtoaster] remove reverse DNS lookup! Vesko Nedev wrote: > Hi all, > > "Preface" > with the latest qmailtoaster update I see there is a check for valid > sender MX record. I personaly would not want my server to check every > mail that comes to the server for valid DNS. What would happen in a smtp > flood?! I guess the server will check the "fake-sender" dns for every > mail. For a high load server I would not like that behaviour! > > What about including the validrcptto patch to check for valid local user > and then accept the message in the mail queue. I have seen that it is > more efficient than the reverse DNS lookup. > > So how can I disable the DNS lookup? (tcp.smtp or the qmail-run script?) > The chkuser patch checks the incoming SMTP connection for a valid recipient. If none, it drops connection. If valid, it accept the email, and then with domain keys checks the DNS records (also SPF, etc.). This is why it requires a DNS server on the mail server as well, to speed up this process (or a caching DNS server). --------------------------------------------------------------------- QmailToaster hosted by: VR Hosted <http://www.vr.org> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- QmailToaster hosted by: VR Hosted <http://www.vr.org> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
