topic Re: sendmail problem in Operating System - Linux

sendmail problem

hanyyu1 — Mon, 16 Jan 2006 02:40:56 GMT

This is the problem of sendmail , the below are my situation ,

1. I tried to use sendmail daemon ( eg. $sendmail mymail_address ) to send mail to my internal mail box , it is very slow ,
2. it is very slow to startup the sendmail daemon ,
3. my /etc/resolv.conf setting is "nameserver 127.0.0.1"
4. the first line of /etc/hosts is "127.0.0.1 localhost.localdomain localhost"

I have tried to config the /etc/nsswitch.conf , /etc/resolv.conf , but it seems not work , is it the problem of sendmail setting ? instead of change the DNS , can I fix the problem by config the sendmail eg. sendmail.cf , sendmail.mc ? thx

Re: sendmail problem

Steven E. Protter — Mon, 16 Jan 2006 02:47:19 GMT

Shalom hanyyu1,

You need to set the /etc/resolv.conf to an external ip address. 127.0.0.1 is your loopback and you can't get the information you need from that.

Find out from your networking department or ISP what the IP addresses of your DNS name servers are and replace the /etc/resolv.conf setting.

Then the mail will flow, assuming port 25 isn't blocked.

SEP

Re: sendmail problem

Stuart Browne — Mon, 16 Jan 2006 02:50:00 GMT

Yes, you can tell sendmail not to look names up via DNS.

See:

define(`confSERVICE_SWITCH_FILE', `/etc/mail/service.switch')dnl

Place this in '/etc/mail/sendmail.mc', and re-make the config (if it's a modern RH box, use 'make').

Create that file with contents similar to:

hosts files

And it should be a bit quicker..

Re: sendmail problem

Ivan Ferreira — Mon, 16 Jan 2006 06:46:19 GMT

Is your server a DNS server?, sendmail is trying to find the hostname for your eth interfaces, not for the loopback only. Ensure that you have a consistent resolution for you ethX interfaces.

Re: sendmail problem

Steven E. Protter — Mon, 16 Jan 2006 12:10:59 GMT

Diagnostic:

sendmail -v -d8 -d38 someone@some.net

Type some text

.

mailq

mailq -Ac

SEP

Re: sendmail problem

Indrajit_1 — Tue, 17 Jan 2006 19:50:56 GMT

Hi;

u should have proper entry in /etc/resolv.conf , /etc/nsswitch.conf and /etc/hosts file..

vi /etc/resolv.conf
search abc.mydomain.com
domain abc.mydomain.com
nameserver

save and come out

vi /etc/nsswitch.conf

host file dns

save and come out..

vi /etc/hosts
hostname ipaddress

save and come out
u should properly configured ur /etc/mail/semdmail.mc (m4 /etc/mail/sendmail.cf > /etc/mail/sendmail.mc)
#telnet hostname_mailserver 25
it should work fine
#cat /etc/mail/sendmail.mc -s "Hi"

Hope it will help u to resolve ur issue..

cheers
indrajit