On 4/27/2011 11:03 AM, Jerry Geis wrote:

I am trying to find a way to "speed" up sendmail going out of my box.

I am setting SMART_HOST. Dont get me wrong email does go out it just takes like 3-4 minutes to get there.

When I do "mail xxxx@y.com" and send it the /var/log/maillog file shows the connection and shows the relay as [127.0.0.1]. Then it just SITS there for a long time.

Then it picks up the mail and delivers it. No errors are show, no timeouts etc...

My box does not have an MX record as I am behind the firewall (192.168.1.X).

I have set the /etc/sysconfig/sendmail QUEUE=1m but that does not seem to help either.

There is nothing else happening on my box so that is not slowing anything down.

I've done some google'ing, some playing and nothing has helped. I tried adding the service.switch to sendmail.mc, I tried temporarily taking out dns from nsswitch.conf - and nothing seemed to help.

How can I get emails exiting my box faster.

Sendmail normally does a reverse DNS lookup (number to name) for the connecting IP and an IDENT query on the socket. If you've configured a firewall to drop these from the receiving mailer, you'll wait for a timeout to happen. Rejecting with an ICMP-denied makes it fast, since it tells the other end not to wait. Note that these will come to the public side of your NAT router. The remote will also be checking that it can resolve the domain in your From: header and probably some other things.

Jerry Geis wrote:

I am trying to find a way to "speed" up sendmail going out of my box.

I am setting SMART_HOST. Dont get me wrong email does go out it just takes like 3-4 minutes to get there.

When I do "mail xxxx@y.com" and send it the /var/log/maillog file shows the connection and shows the relay as [127.0.0.1]. Then it just SITS there for a long time.

Then it picks up the mail and delivers it. No errors are show, no timeouts etc...

My box does not have an MX record as I am behind the firewall (192.168.1.X).

I have set the /etc/sysconfig/sendmail QUEUE=1m but that does not seem to help either.

There is nothing else happening on my box so that is not slowing anything down.

I've done some google'ing, some playing and nothing has helped. I tried adding the service.switch to sendmail.mc, I tried temporarily taking out dns from nsswitch.conf

• and nothing seemed to help.

How can I get emails exiting my box faster.

Jerry

Gregory - Thanks for the DNS info.

Another avenue I just tried was setting up AuthInfo with a user and account and that goes much faster now also. Perhaps loging in to the email server by passes any DNS lookup it was trying to do.

Thanks,

Jerry