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Top Forums UNIX for Beginners Questions & Answers Sendmail - issue within DMZ for some servers but not all Post 303032617 by dakelly on Thursday 21st of March 2019 04:23:13 AM
Old 03-21-2019
Sendmail - issue within DMZ for some servers but not all

Hi All,

I have a strange issue and I am not sure where the problem lies.

I have about six Ubuntu servers on our DMZ two of which were built on 18.04 from scratch the others were upgraded to 18.04 from 16.04.
The servers built from scratch can send emails from the server via sendmail fine, so the Firewall rules for coming from DMZ to our internal network is fine.
The servers upgraded to 18.04 cannot send out emails, it is as if sendmail does not work.

This is what I get
Code:
root@DMZ-Server:~# echo "test" | sendmail -v me@domain
domain: Name server timeout
me@domain... Transient parse error -- message queued for future delivery
me@domain... queued
root@DMZ-Server:~#

I have uninstalled & purged sendmail from a server that does not work and re-installed.
I have updated the sendmail.cf to point to the mail server
Code:
define(`SMART_HOST',`MailServer.domain')dnl

the Hosts file has the relevant info...

It still does not work...

could someone help or point me in the right direction?
I am having the same issue on all systems in the DMZ that have updated from 16.04 - 18.04
 

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SENSIBLE-MDA(8) 					      System Manager's Manual						   SENSIBLE-MDA(8)

NAME
sensible-mda - a generic local MDA router for Debian systems SYNOPSIS
sensible-mda from to detail client-addr DESCRIPTION
sensible-mda is used to simplify the installation and configuration of sendmail(8) , or other MTAs for use on Debian systems. With sensi- ble-mda, sendmail can support a plethora of MDAs (procmail, maildrop, deliver, etc.) without having pick any one of them as required. FUNCTION
sensible-mda is called by sendmail as a local mailer when the following exists in sendmail.mc: define(`LOCAL_MAILER_ARGS', `sensible-mda $g $u $h ${client_addr}')dnl sensible-mda will look for the following MDAs (in this order), and pass the mail on to the first SUID MDA found (Or first found MDA, if run w/euid=root): procmail(1), maildrop(1), deliver(8), mail.local(8) OPTIONS
Available command line options are the following: from The sender of this email (sendmail $g variable) to The recipient of this email (sendmail $u variable) detail The detail portion of the recipient userid (sendmail $h variable) - ie: cowboy+sendmail@debian.org client-addr TCP/IP address of the sender (sendmail ${client_addr} variable) Not used (for the nonce) FILES
/etc/mail/sendmail.mc sendmail m4 input to generate sendmail.cf /etc/mail/sendmail.cf actual sendmail configuration file (treated as a binary file) SEE ALSO
sendmail(8), procmail(1), maildrop(1), deliver(8), mail.local(8) BUGS
None known so far. AUTHOR
Richard Nelson <cowboy@debian.org> HISTORY
4th Berkeley Distribution October 21 1999 SENSIBLE-MDA(8)
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