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).
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