Delay from nullclient

[sureshp]

Hi All,
We have lot of null client set up in our domain, which forwards mail to a Mail Hub, which is also, the DNS server for the domain. Whenever I send the mail from nullclient it takes more than one minute to reach the mail hub. From hub it is cleared to the outside world in a second. Anyone has an idea why this delay occurs.
P.S. All the mails are forwarded from null client to mail hub with the help of Ruleset 0 (I guess, after checking the sendmail.cf). We don’t have any MX record in our DNS named.data file.

Regards
Suresh

 

[RhythmAce]

It is looking for the return address in dns. Turning off dns lookups will speed things up a bit.

 

[sureshp]

Yep, You got it. When I disbled the DNS lookup from nsswitch.conf file, It went fine. But I am not going to change the nsswitch.conf file permanently. I planned to add an MX record in the DNS. Hope this will solve my problem. If I am wrong please correct me.

Thanks and Regards
Suresh

 

[sureshp]

Hi,
I have added the MX entry in my DNS for the whole domain. But still the mails are taking more than one minute to reach the mail hub. In nsswitch.conf I have dns,local setup. Do I have to do anything in the sendmail.cf file of the client or mail hub.

Thanks
Suresh