[SOLVED] sendmail sometimes sending emails and sometimes not

deep27ak · 11-04-2011, 08:19 AM

Quote:

Originally Posted by Majed17

yes you are correct. you understood it to the letter it seems

i just checked the exchange server on bellakt and all the mail on bellakt arrived after the exchange server is up and running again.
but the problem is when sending to profiland or hotmail for that matter

some emails arrive and some get status unavailable.. i'm reading on the internet and some say this is a dns problem others say the server sending the emails has to be from a real domain which is true (bellakt.com is a real domain) yet others say that the mail server (mx2) is rejecting the emails.
when i configured send mail i was expecting to supply some smtp address and pop3 but it started working simply after installing it so i thought it is an smtp server by itslef.
today the work day is over so i'm going to try adding the feature you meantioned later but i think it will cause problems for sending emails to the bellakt local domain.
monday will be holiday here (they still celebrate the october revolution of 1917 over here) so i'll be back on tuesday and hopefully you'll still be fine by then

yup you can configure a sendmail smtp server with spamassassin which could be the best I suppose

DNS may or may not be the reason but in that case the error which comes is different i.e. some where related to mail goes in a queue after a long wait

I don't think that is the issue in your case

Majed17 · 11-08-2011, 12:13 AM

i tried adding the feature but it didn't work.
i sent first an email to monitoring @ profiland.by but i got :

Code:

Nov  8 09:00:20 srvmon-Bellakt sm-mta[31517]: pA860DFV031517: to=<monitoring@profiland.by>, ctladdr=<root@srvmon-Bellakt.Bellakt.com> (0/0), delay=00:00:07, xdelay=00:00:07, mailer=esmtp, pri=30332, relay=mx1.activeby.net. [109.237.213.143], dsn=5.0.0, stat=Service unavailable
Nov  8 09:00:20 srvmon-Bellakt sm-mta[31517]: pA860DFV031517: pA860DFW031517: DSN: Service unavailable
Nov  8 09:00:20 srvmon-Bellakt sm-mta[31517]: pA860DFW031517: to=<root@srvmon-Bellakt.Bellakt.com>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31356, relay=local, dsn=2.0.0, stat=Sent
Nov  8 09:00:20 srvmon-Bellakt sendmail[31420]: pA8609dp031420: to=monitoring@profiland.by, ctladdr=root (0/0), delay=00:00:11, xdelay=00:00:07, mailer=relay, pri=30007, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (pA860DFV031517 Message accepted for delivery)

and it didn't arrive.
i next sent to admin50 @ bellakt.com but the message arrived.

now my sendmail.mc looks like this:

Code:

divert(-1)
divert(0)dnl
include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
VERSIONID(`$Id: sendmail.mc,v 1.2 2004/12/07 01:59:31 g2boojum Exp $')dnl
OSTYPE(linux)dnl
DOMAIN(generic)dnl
FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
FEATURE(`local_lmtp',`/usr/sbin/mail.local')dnl
MASQUERADE_AS(bellakt.com)dnl
FEATURE(masquerade_envelope)dnl
FEATURE(masquerade_entire_domain)dnl
MASQUERADE_DOMAIN(bellakt.com)dnl
FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl
MAILER(local)dnl
MAILER(smtp)dnl

after modifying sendmail.mc i applied the command:

Code:

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

then

Code:

/etc/init.d/sendmail restart

but it seems that it didn't help, the situation is unchanged, i still get mail undelivered.

anything more to try?

deep27ak · 11-08-2011, 02:25 AM

add this line in sendmail.mc

Code:

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl

Code:

#m4 sendmail.mc > sendmail.cf

and put the IP of your machine in access file the way you did earlier and map into access.db

Majed17 · 11-08-2011, 03:17 AM

ok i added

Code:

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl

to sendmail.mc and now sendmail.mc looks like this:

Code:

divert(-1)
divert(0)dnl
include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
VERSIONID(`$Id: sendmail.mc,v 1.2 2004/12/07 01:59:31 g2boojum Exp $')dnl
OSTYPE(linux)dnl
DOMAIN(generic)dnl
FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
FEATURE(`local_lmtp',`/usr/sbin/mail.local')dnl
MASQUERADE_AS(bellakt.com)dnl
FEATURE(masquerade_envelope)dnl
FEATURE(masquerade_entire_domain)dnl
MASQUERADE_DOMAIN(bellakt.com)dnl
FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl
DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
MAILER(local)dnl
MAILER(smtp)dnl

then i executed the command:

Code:

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

then i added my eth1 interface address to the access file and now it looks like this:

Code:

Connect:109.237.213.144          RELAY
Connect:172.16.40.1              RELAY

and then executed the command:

Code:

makemap -r hash /etc/mail/access.db < /etc/mail/access

then i restarted sendmail:

Code:

/etc/init.d/sendmail restart

then i sent 10 emails to profiland and 10 to bellakt and all arrived

and i even sent to my hotmail and it arrived to the inbox

at last it is so far working fine. it seems relaying my own ip address was needed.
thanks alot for your help, i hope you learned something from all this too

deep27ak · 11-08-2011, 03:41 AM

yes even I am trying to learn ways to troubleshoot being a newbie

I would still like to know few things if you don't mind
109.237.213.144 seemed to me like a public IP

can you explain your organizations scenario to me as I am still confused with few stuffs

what is the ip of your machine?
on which ip DNS is configured?
on which IP sendmail is configured and what is the hostname?

Majed17 · 11-08-2011, 04:26 AM

well i am connecting through vpn from profiland to the bellakt domain.
here is the net configuration:

Code:

config_eth1="172.16.1.40/16"
routes_eth1="default via 172.16.1.254" 
dns_servers_eth1="172.16.1.1 172.16.1.2"

i connect through vpn and my ip is from the 10.1.1.0 range
the gento machine is named:
srvmon-Bellakt.Bellakt.com and it mainly uses 172.16.1.1 as dns

regarding sendmail i used to be able to telnet on all ip's on smtp
now after putting :

Code:

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl

it is only able to telnet on localhost and not 172.16.1.40
do you think anything is still unsecure about the sendmail configuration?

Majed17 · 11-08-2011, 05:03 AM

i made a mistake in the access file the ip address was 172.16.40.1 and i corrected it to 172.16.1.40 and still everything is working.

deep27ak · 11-08-2011, 05:12 AM

Quote:

Originally Posted by Majed17

i made a mistake in the access file the ip address was 172.16.40.1 and i corrected it to 172.16.1.40 and still everything is working.

check the logs
what was the IP which all the mails used to relay all mails

Majed17 · 11-08-2011, 05:18 AM

Code:

relay=mx2.activeby.net. [109.237.213.144], dsn=2.0.0, stat=Sent (OK id=1RNiuy-0008UE-3E)

i guess the own ip relay is not neccessary what was neccessary :

Code:

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl

deep27ak · 11-08-2011, 05:24 AM

Quote:

Originally Posted by Majed17

Code:

relay=mx2.activeby.net. [109.237.213.144], dsn=2.0.0, stat=Sent (OK id=1RNiuy-0008UE-3E)

i guess the own ip relay is not neccessary what was neccessary :

Code:

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl

as per me that option is necessary as you are defining your machine where you have configured sendmail as mail transfer agent (MTA) i.e smtp server