Re: [Exim] strange smtp delay?

On Thu, Sep 06, 2001 at 09:39:26PM +0100, Jason wrote:
>I currently have a problem which has got me very confused!!
>EVERY smtp connection to my mailserver takes exactly 30seconds from initial
>connection to complete. (as below)
>
>If you try to telnet to my mailserver on port 25 it also takes exactly
>30seconds before I get the mailserver greeting! Its running Solaris 2.7 &
>Exim 2.12. Am I missing somthing obvious? I don't know what to check next!

DNS.

The target machine is trying to reverse-map the IP address of the source
machine to verify its identity; it's timing out after 30 seconds.

Things to do:

(1) make sure the source machine has a PTR record associated with its IP;
(2) make sure the target machine can resolve DNS including that record;
(3) upgrade to Exim v3 - this is nothing to do with your problem but
it's a good idea on general principles.

Roger