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
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
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
Hi gurus!
I need help to make sendmail to accept unknown user mail. That is if the user does not exist sendmail keep on processing the mail and store it in a some mailbox ...
Thanks for any idea! (5 Replies)
Hi,
yesterday I had issues, sendmail was not responding quickly while sending email and users did not receive any email,
This happened with sendmail on solaris 10 and also with sendmail on a linux box.
Found it is something to do with DNS blacklists,
following lists did not work for me,... (2 Replies)
Hi Team,
I have a script written to sendmail along with attachment in html format.
The code is
export MAILFROM="abc@abc.com"
export MAILTO="abc@abc.com"
export CONTENT="./GRP_SPI_ERR.html"
export SUBJECT="TEST EMAIL: TESTING HTML"
{
print - "From: $MAILFROM"
print - "To: ${MAILTO}"... (3 Replies)
Hi, Guru
i had configure in my two server to send out the email.
One of the server able to send in the reasonable timing. but another not, it delay almost one day or two days but mostly not send at all.
below is the syslog when i try to send out the mail.
GOOD Server
Dec 28 11:29:39... (5 Replies)
Hi all,
we are using solaris 10. we need to increase every users mail boxes size as all users mail boxes got filled..Please help..its urgent..
Thanks in advance.. (1 Reply)
Hi Gurus,
I have been tampering around with sendmail for the past one week and seem to make little progress. Given below is an abstract of the issue.
I have a Fedora 12 server(A VM on vitual Box bridged with a Windows XP host) which has to act as a SMTP server and have accordingly put up the... (8 Replies)
Hi Every One,
one of our server configuration on sendmail config
we are using SMAR_HOST
###
define(`SMART_HOST', 'mail.xxx.com')
and /etc/sysconfig/sednmail DAEMON is setted to NO
so let me know why sendmail is not working for this server
any this else u need please do let me know (0 Replies)
Hi,
I'm using sendmail version 8.13.8-8.1.el5_7. I'm pretty new to it. The servera are running RHEL 5.8. My question basically is that I would want to know is there a way to change the from address. I would be able to change it using the return address in mailx command. However I would like to... (3 Replies)
Dear All ,
I have some problem in Sendmail , where it was sending mails perfectly fine with the Ip address of the client machine.
But suddenly there was an issue , the SMTP takes the IP of the bond1 interface.
So the IP could not get validated in the relay server.
So how should i send... (1 Reply)
Discussion started by: jegaraman
1 Replies
LEARN ABOUT SUNOS
etrn
etrn(1M) System Administration Commands etrn(1M)NAME
etrn - start mail queue run
SYNOPSIS
etrn [-b] [-v] server-host [client-hosts]
DESCRIPTION
SMTP's ETRN command allows an SMTP client and server to interact, giving the server an opportunity to start the processing of its queues
for messages to go to a given host. This is meant to be used in start-up conditions, as well as for mail nodes that have transient connec-
tions to their service providers.
The etrn utility initiates an SMTP session with the host server-host and sends one or more ETRN commands as follows: If no client-hosts are
specified, etrn looks up every host name for which sendmail(1M) accepts email and, for each name, sends an ETRN command with that name as
the argument. If any client-hosts are specified, etrn uses each of these as arguments for successive ETRN commands.
OPTIONS
The following options are supported:
-b System boot special case. Make sure localhost is accepting SMTP connections before initiating the SMTP session with server-
host.
This option is useful because it prevents race conditions between sendmail(1M) accepting connections and server-host
attempting to deliver queued mail. This check is performed automatically if no client-hosts are specified.
-v The normal mode of operation for etrn is to do all of its work silently. The -v option makes it verbose, which causes etrn
to display its conversations with the remote SMTP server.
ENVIRONMENT VARIABLES
No environment variables are used. However, at system start-up, svc:/network/smtp:sendmail reads /etc/default/sendmail. In this file, if
the variable ETRN_HOSTS is set, svc:/network/smtp:sendmail parses this variable and invokes etrn appropriately. ETRN_HOSTS should be of the
form:
"s1:c1.1,c1.2 s2:c2.1 s3:c3.1,c3.2,c3.3"
That is, white-space separated groups of server:client where client can be one or more comma-separated names. The :client part is optional.
server is the name of the server to prod; a mail queue run is requested for each client name. This is comparable to running:
/usr/lib/sendmail -qR client
on the host server.
EXAMPLES
Example 1: Using etrn
Inserting the line:
ETRN_HOSTS="s1.domain.com:clnt.domain.com s2.domain.com:clnt.domain.com"
in /etc/default/sendmail results in svc:/network/smtp:sendmail invoking etrn such that ETRN commands are sent to both s1.domain.com and
s2.domain.com, with both having clnt.domain.com as the ETRN argument.
The line:
ETRN_HOSTS="server.domain.com:client1.domain.com,client2.domain.com"
results in two ETRN commands being sent to server.domain.com, one with the argument client1.domain.com, the other with the argument
client2.domain.com.
The line:
ETRN_HOSTS="server1.domain.com server2.domain.com"
results in set of a ETRN commands being sent to both server1.domain.com and server2.domain.com; each set contains one ETRN command for each
host name for which sendmail(1M) accepts email, with that host name as the argument.
FILES
/etc/mail/sendmail.cf sendmail configuration file
/etc/default/sendmail Variables used by svc:/network/smtp:sendmail
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWsndmu |
+-----------------------------+-----------------------------+
|Interface Stability |Stable |
+-----------------------------+-----------------------------+
SEE ALSO sendmail(1M), attributes(5)
RFC 1985
NOTES
Not all SMTP servers support ETRN.
SunOS 5.10 10 Aug 2004 etrn(1M)