11-04-2003
Sendmail open relay
All
I am having a bit of a problem with my sendmail smtp server. The environment:
Redhat Linux 8
sendmail-8.12.8-9.80.
The mailserver is used by our application to send mail notifications to users on the system. The application is hosted on 2 different servers (separate domains) which use the same smtp server to send mails.
The problem is, every now and then we get these messages (apparently spam sent from my user account)... my e-mail ID is used...and I saw the following entry in the maillog file:
Nov 4 14:02:33 MUSTANG sendmail[19338]: hA4J2Vht019338: from=<myself@mydomain.com>, size=1525, class=0, nrcpts=1, msgid=<08a201c3a306$a99a3cf5$b400a8c0@lab50313>, proto=ESMTP, daemon=Daemon0, relay=[209.186.12.86]
I got the IP address from the message header and grepped the maillog file.
Is it possible that someone is using my smtp server for spam? does the above message mean that the mail was sent put from my smtp server... seems so right?
I need to be able to stop this.
The following directives are set in the sendmail.cf file:
# Hosts for which relaying is permitted ($=R)
FR-o /etc/mail/relay-domains
The /et/mail/relay-domains contain 2 entries... of the two domains I trust.
The /etc/mail/access has the domain names of the above 2 domains (one is localdomain, and 1 more domain that I trust along with the IP address.).
Am i missing a configuration that will allow relaying from only the two trusted hosts?
Any help will be greatly appreciated.
Thanks
KS
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LEARN ABOUT OPENSOLARIS
praliases
praliases(1) User Commands praliases(1)
NAME
praliases - display system mail aliases
SYNOPSIS
praliases [-C configfile] [-f aliasfile] [key]
DESCRIPTION
The praliases utility displays system mail aliases. When no key is given, praliases displays the current system aliases, one per line, in
no particular order. The form is key:value. If a key is given, only that key is looked up and the appropriate key:value is displayed if
found.
OPTIONS
The following options are supported:
-C configfile Specifies a sendmail configuration file.
-f aliasfile Reads the specified file aliasfile instead of the default sendmail system aliases file.
OPERANDS
The following operands are supported:
key A specific alias key to look up.
EXIT STATUS
The following exit values are returned:
0 Successful operation.
>0 An error occurred.
FILES
/etc/mail/aliases Default sendmail system aliases file
/etc/mail/aliases.db Database versions of the /etc/mail/aliases file
/etc/mail/aliases.dir Database versions of the /etc/mail/aliases file
/etc/mail/aliases.pag
/etc/mail/sendmail.cf Default sendmail configuration file
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWsndmu |
+-----------------------------+-----------------------------+
SEE ALSO
mailq(1), newaliases(1M), sendmail(1M), attributes(5)
SunOS 5.11 29 Mar 2004 praliases(1)