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smtp access from internal network slow

I am running IMS 5.1 on Solaris 8.When I do a Telnet localhost 25,the smtp response is fast,when I do the same from any of the system on our internal network it takes time for the smtp to respond.But the same smtp response is fast when I try to open the port from external network(over the internet).Due to this all the mails initiated internally gets stuck in the MS outlook outbox for quite a while before its send out.Receiving mails are lightening fast.

FYI: We are doing a NAT internally as our Mail server is on DMZ

Note: Even systems on the same subnet as Mail server got to wait a long for the smtp port to open.

The http access(Messenger express) from internal is pretty fast.

Any help or Solution would be highly appreciated.

.

[789 byte] By [708756] at [2007-11-25 7:10:33]
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# 1

You'll want to take a look at http://docs.iplanet.com/docs/manuals/messaging/ims51/rm/mta_conf.htm#1028395

I suspect the issue is that when the MTA does the reverse lookup of your internal IP addresses it takes time, and thus the connection is delayed until that lookup returns, either positive or negative.

See the link above for different channel keywords for ways to change the behavior of the MTA and thus remove the slow response.

708686 at 2007-6-29 17:42:56 > top of Java-index,E-Mail, Calendar, & Collaboration,Sun Java System Messaging Server...
# 2
I have experienced similar SMTP problem. My iMS5.2 server is outside of firewall. It is very slow for me to send email from internal network behind firewall. The same procedure is fast if I do it outside of firewall.Any help would be highly appreciated.
706673 at 2007-6-29 17:42:56 > top of Java-index,E-Mail, Calendar, & Collaboration,Sun Java System Messaging Server...
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