delay response when telnet x.x.x.x 25

[ccto]

Hello all,

I have a server that the SMTP port service is slow response.

In my desktop PC, when I issue "telnet x.x.x.x 25 , it takes around 10 seconds then shows the exim smtp greeting message - 220 xxxx_hostname_here ESMTP Exim 4.43 Mon, 21 Nov 2005
It also happens when I SSH to the server and telnet localhost 25

However, for other server, if I telnet to port 25, it immediately shows the welcome message.

Any idea?
Thanks a lot.

Regards,
George

 

[DirectAdmin Support]

Hello,

That's a security feature in exim.
If a spammer is using a dumb spamming script, the script will likely send all data before the welcome headers appear, which is against the rfc standards (client must wait until message before sending).

If you want to get rid of the delay, this guide has the option to turn it off:
http://help.directadmin.com/item.php?id=83

John