OSDev.org

Posted: **Sat May 01, 2010 10:13 pm**

I am setting up sendmail to be my SMTP server on my computer I want it to beable to send and recieve any type of email.
i.e I want it to be wide open null senders ,....anything goes.

I thought adding FEATURE(promiscuous_relay) would do it but it didn't.
I did a port scan with zenmap and it said the port 25 was open but sendmail is not accepting mail.
When I telnet to 192.168.1.100 I can send mails to anybody that has an email account on this server 192.168.1.100.
But I want to have it so sendmail can send anybody an email from this server and recieve an email from this server from anybody else.

Am I missing something to comment out in this mc when I add the FEATURE(promiscuous_relay)

here is my sendmail.mc

Code: Select all

divert(-1)dnl
#-----------------------------------------------------------------------------
# $Sendmail: debproto.mc,v 8.14.3 2010-02-15 09:38:10 cowboy Exp $
#
# Copyright (c) 1998-2009 Richard Nelson.  All Rights Reserved.
#
# cf/debian/sendmail.mc.  Generated from sendmail.mc.in by configure.
#
# sendmail.mc prototype config file for building Sendmail 8.14.3
#
# Note: the .in file supports 8.7.6 - 9.0.0, but the generated
#	file is customized to the version noted above.
#
# This file is used to configure Sendmail for use with Debian systems.
#
# If you modify this file, you will have to regenerate /etc/mail/sendmail.cf
# by running this file through the m4 preprocessor via one of the following:
#	* make   (or make -C /etc/mail)
#	* sendmailconfig 
#	* m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
# The first two options are preferred as they will also update other files
# that depend upon the contents of this file.
#
# The best documentation for this .mc file is:
# /usr/share/doc/sendmail-doc/cf.README.gz
#
#-----------------------------------------------------------------------------
divert(0)dnl
#
#   Copyright (c) 1998-2005 Richard Nelson.  All Rights Reserved.
#
#  This file is used to configure Sendmail for use with Debian systems.
#
define(`_USE_ETC_MAIL_')dnl
include(`/usr/share/sendmail/cf/m4/cf.m4')dnl
VERSIONID(`$Id: sendmail.mc, v 8.14.3-9.1ubuntu1 2010-02-15 09:38:10 cowboy Exp $')
OSTYPE(`debian')dnl
DOMAIN(`debian-mta')dnl
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
undefine(`confHOST_STATUS_DIRECTORY')dnl        #DAEMON_HOSTSTATS=
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
dnl #
dnl # General defines
dnl #
dnl # SAFE_FILE_ENV: [undefined] If set, sendmail will do a chroot()
dnl #	into this directory before writing files.
dnl #	If *all* your user accounts are under /home then use that
dnl #	instead - it will prevent any writes outside of /home !
dnl #   define(`confSAFE_FILE_ENV',             `')dnl
dnl #
dnl # Daemon options - restrict to servicing LOCALHOST ONLY !!!
dnl # Remove `, Addr=' clauses to receive from any interface
dnl # If you want to support IPv6, switch the commented/uncommentd lines
dnl #
FEATURE(promiscuous_relay)
FEATURE(`no_default_msa')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MTA-v6, Port=smtp, Addr=::1')dnl
DAEMON_OPTIONS(`Family=inet,  Name=MTA-v4, Port=smtp, Addr=192.168.1.100' )dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MSP-v6, Port=submission, M=Ea, Addr=::1')dnl
DAEMON_OPTIONS(`Family=inet,  Name=MSP-v4, Port=submission, M=Ea, Addr=192.168.1.100' )dnl
dnl #
dnl # Be somewhat anal in what we allow
define(`confPRIVACY_FLAGS',dnl
`needmailhelo,needexpnhelo,needvrfyhelo,restrictqrun,restrictexpand,nobodyreturn,authwarnings')dnl
dnl #
dnl # Define connection throttling and window length
define(`confCONNECTION_RATE_THROTTLE', `15')dnl
define(`confCONNECTION_RATE_WINDOW_SIZE',`10m')dnl
dnl #
dnl # Features
dnl #
dnl # use /etc/mail/local-host-names
FEATURE(`use_cw_file')dnl
dnl #
dnl # The access db is the basis for most of sendmail's checking
FEATURE(`access_db', , `skip')dnl
dnl #
dnl # The greet_pause feature stops some automail bots - but check the
dnl # provided access db for details on excluding localhosts...
FEATURE(`greet_pause', `1000')dnl 1 seconds
dnl #
dnl # Delay_checks allows sender<->recipient checking
FEATURE(`delay_checks', `friend', `n')dnl
dnl #
dnl # If we get too many bad recipients, slow things down...
define(`confBAD_RCPT_THROTTLE',`3')dnl
dnl #
dnl # Stop connections that overflow our concurrent and time connection rates
FEATURE(`conncontrol', `nodelay', `terminate')dnl
FEATURE(`ratecontrol', `nodelay', `terminate')dnl
dnl #
dnl # If you're on a dialup link, you should enable this - so sendmail
dnl # will not bring up the link (it will queue mail for later)
dnl define(`confCON_EXPENSIVE',`True')dnl
dnl #
dnl # Dialup/LAN connection overrides
dnl #
include(`/etc/mail/m4/dialup.m4')dnl
include(`/etc/mail/m4/provider.m4')dnl
dnl #
dnl # Default Mailer setup
MAILER_DEFINITIONS
MAILER(`local')dnl
MAILER(`smtp')dnl

Thanks for any help

Posted: **Sun May 02, 2010 3:26 am**

I presume you are running this on a home connection?

Then even if you configure it, it is not going to work. Many mail servers use the Spamhaus Policy Blacklist, which blocks all mail from netblocks who's owners say should not be sending mail.

This includes the IP ranges used for home connections.

The correct thing to do in your case is either use your ISP's SMTP server, or someone else's. In either case, you could setup your local mail server as a smarthost pointing to one of them.

However, I have a second and more important issue for you:

Sendmail? SENDMAIL?! Are you mad?! Sendmail's security track record is so lackluster I wouldn't touch it with a 2kilometer long pole! Seriously, use Postfix.

Posted: **Sun May 02, 2010 11:48 am**

Ok ,

But I thought open relay will allow me to relay emails to any server.

Anyway I have dynamic dns setup so I have my own host name.

I will try postfix if that is a more secure choice howerver I still want the ability to relay mail of the internet,
I know their is a way of setting it up to do this???

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