03-12-2010
How do I configure sendmail to block all OUTGOING mail FROM one userid TO the world?
Hello,
ENVIRONMENT:
OS: Solaris 10
Sendmail: 8.13.8+Sun
BACKGROUND:
We had a user account that was compromised and was used as a relay. She sent out (or would have if we didn't kill sendmail) ~10K emails alerting people they just won $75K.
The target for this spam was everyone internal to our company and EVERYONE with an @aol.com address, maybe other domains as well, we just stopped looking. Stopping all mail for our company until we took her offline was not a suitable solution.
QUESTION:
Is it possible to configure sendmail as to block ALL OUTGOING email from ONE user? I don't want to shut down mail for the entire organization again. I've seen solutions on how to block INCOMING and how to block outgoing TO targets, but not how to block ALL OUTGOING FROM the sender.
Any help would be greatly appreciated.
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System Administration Commands etrn(8)
NAME
etrn - start mail queue run
SYNOPSIS
etrn [-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 pro
cessing 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 connections to their ser
vice 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 option is supported:
-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
No environment variables are used.
FILES
/etc/mail/sendmail.cf sendmail configuration file
SEE ALSO
sendmail(1M), RFC 1985.
CAVEATS
Not all SMTP servers support ETRN.
CREDITS
Leveraged from David Muir Sharnoff's expn.pl script. Chris
tian von Roques added support for args and fixed a couple of
bugs.
AVAILABILITY
The latest version of etrn is available in the contrib
directory of the sendmail distribution through anonymous ftp
at ftp://ftp.sendmail.org/ucb/src/sendmail/.
AUTHOR
John T. Beck <john@beck.org>