Vesko Nedev wrote:
Mattias Segerdahl wrote:
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).
And what options do I have if I want to upgrade a qmailtoaster
installation but do not wan't the dns lookup (at least not now)?
I updated my test server without activating domain keys (installed it
anyway) but the reverse lookup bothers me, because of that extra
traffic and server work it generates.
If you're talking about the reverse DNS lookups done by tcpserver, this
can be turned off with a switch in your /var/qmail/supervise/smtp/run file.
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