setting up mail and/or sendmail to use third party SMTP gateway.

Everyone,

I have been getting bogged down and confused with the documentation on 
setting up mail to send to a SMTP gateway. The problem is there is no 
internal MX record(s) in DNS and we will not be adding any. I want to send 
output  to my corporate email account from our snort sensors when rules 
are changed through oinkmaster. Any ideas on where I can start would be 
useful. 

Thank you

Rick

Richard Thimble
Century Bank
400 Mystic Avenue
Medford, MA 02155
Telephone: [phone]
Mobile: [phone]
Email: rthimble(a)century-bank.com
www.century-bank.com


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[Timothy Selivanow]

On Wed, 2008-02-06 at 14:28 -0500, RThimble(a)century-bank.com wrote:
>  Everyone,
>  
>  I have been getting bogged down and confused with the documentation on 
>  setting up mail to send to a SMTP gateway. The problem is there is no 
>  internal MX record(s) in DNS and we will not be adding any. I want to send 
>  output  to my corporate email account from our snort sensors when rules 
>  are changed through oinkmaster. Any ideas on where I can start would be 
>  useful. 
>  
>  Thank you
>  
>  Rick
>  
>  Richard Thimble
>  Century Bank
>  400 Mystic Avenue
>  Medford, MA 02155
>  Telephone: [phone]
>  Mobile: [phone]
>  Email: rthimble(a)century-bank.com
>  www.century-bank.com
>  
>  
>  E-Mail confidentiality disclaimer:
>  
>  The information contained in this message (including attachments) may be privileged and
> confidential and protected from disclosure. If the reader of this message is not the
> intended recipient, or an employee or agent responsible for delivering this message to the
> intended recipient, you are hereby notified that any review, dissemination, distribution
> or copying of this communication is strictly prohibited. If you have received this
> communication in error, please notify us immediately by replying to the message,
> destroying all copies and deleting it from your computer. 
If you aren't opposed to using Postfix, I'd recommend that as the
configuration makes more sense than Sendmail IMO.  In Postfix, you'd
just add a line that says:

	relayhost = [IP or FQDN of relay host]

In fact, that is already in the shipped main.cf just commented out (very
verbose default config file).

A *long* time ago I looked at Sendmail initially, but we use Postfix at
work so when I started to ask questions about Sendmail everyone said to
use Postfix...or to always have FQDN (and reverse) for everything, that
way it magically Just Works (TM).


--Tim
 ___________________________________________________________ 
/ "Just think, with VLSI we can have 100 ENIACS on a chip!" \
\ -- Alan Perlis                                            /
 ----------------------------------------------------------- 
  \
   \   \
        \ /\
        ( )
      .( o ).

[Paul Lemmons]

-------- Original Message  --------
Subject: setting up mail and/or sendmail to use third party SMTP gateway.
From: RThimble(a)century-bank.com
To: fedora-list(a)redhat.com
Date: 02/06/2008 12:28 PM

>  Everyone,
>  
>  I have been getting bogged down and confused with the documentation on 
>  setting up mail to send to a SMTP gateway. The problem is there is no 
>  internal MX record(s) in DNS and we will not be adding any. I want to send 
>  output  to my corporate email account from our snort sensors when rules 
>  are changed through oinkmaster. Any ideas on where I can start would be 
>  useful. 
>  
>  Thank you
>   
What I think you want to do is setup your local sendmail to usea a 
"smart relay host" This can be accomplished two ways:


edit /etc/mail/sendmail/cf and look for:

# "Smart" relay host (may be null)
DS

and change it to

# "Smart" relay host (may be null)
DSmail.mydomain.com

then issue the command "service sendmail restart"


That is the easiest way. The "better" way is to edit the file: 
/etc/mail/sendmail.mc and find:

dnl # be sent out through an external mail server:
dnl #
dnl define(`SMART_HOST', `smtp.your.provider')dnl
dnl #

and change it to:

define(`SMART_HOST', `mail.mydomain.com')dnl

Note the quotes are ` and '

Then issue the command "make restart"

You would, of course, change "mail.mydomain.com" to the name of your 
local smtp server.

[Garry Williams]

On Wednesday 06 February 2008 14:46:24 Paul Lemmons wrote:
>  That is the easiest way. The "better" way is to edit the
> file:
>  /etc/mail/sendmail.mc and find:
>
>  dnl # be sent out through an external mail server:
>  dnl #
>  dnl define(`SMART_HOST', `smtp.your.provider')dnl
>  dnl #
>
>  and change it to:
>
>  define(`SMART_HOST', `mail.mydomain.com')dnl 
It's also useful to understand that sendmail will attempt to find the
MX host for that name if it is specified as above.  This can be the
correct behavior, but more often you want to specify

    define(`SMART_HOST', `[mail.mydomain.com]')dnl

to suppress that MX lookup and just use the A record of that host.

-- 
Garry T. Williams --- [phone]

[Matt Domsch]

On Wed, Feb 06, 2008 at 02:28:45PM -0500, RThimble(a)century-bank.com wrote:
>  Everyone,
>  
>  I have been getting bogged down and confused with the documentation on 
>  setting up mail to send to a SMTP gateway. The problem is there is no 
>  internal MX record(s) in DNS and we will not be adding any. I want to send 
>  output  to my corporate email account from our snort sensors when rules 
>  are changed through oinkmaster. Any ideas on where I can start would be 
>  useful.  
The simplest way with sendmail is to create a file
/etc/mail/mailertable  with a single line:

.   smtp:[smtp-server.your-isp.com]


(yes, it starts  with a period, then whitespace, then the rest.)

Thanks,
Matt

-- 
Matt Domsch
Linux Technology Strategist, Dell Office of the CTO
linux.dell.com & www.dell.com/linux