OT: Multiple Outgoing IPs?

[Aaron K. Moore]

Jim Coates wrote:
>> -----Original Message-----
>> From: mailscanner-bounces at lists.mailscanner.info
>> [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of
>> Alex Neuman van der Hans Sent: Tuesday, April 03, 2007 8:03 AM
>> To: MailScanner discussion
>> Subject: Re: OT: Multiple Outgoing IPs?
>> 
>> 
>> Res wrote:
>>> On Mon, 2 Apr 2007, Jim Coates wrote:
>>> 
>>>> Because of how we track bonded sender info and such, I need to have
>>>> both domains (one for each company) sending outgoing mail on
>>>> different IPs.
>>> 
>>> Look at Sendmail 8.14.x
>>> 
>>> This will probably mean dumping whatever flavour distros ancient
>>> version you have installed and useing the tarball.
>>> 
>>> 
>> Unless you have a redhat-like distro; if you do, you can find the
>> rpms (with source rpms as well) at
>> http://www.city-fan.org/ftp/contrib/mail/ 
>> 
> 
> Well, I talked to my ISP about the "multiple instances of SendMail"
> and this was the response they gave me: 
> 
> Sendmail by default listens on all avialable ip addresses.  Using the
> outline you've provided does the following: 
> 
> 2 seperate instances of sendmail, 1 listening on the base ip while
> the other listens on the second ip. 
> 
> One then can be configured to relay all mail received to a smart
> host, while the other doesn't.  However, the doesn't prevent a user
> from using the first instance.  (Nor am I actually sure how to split
> the configs amongst sendmail instlalations).   
> 
> Additionally, /usr/sbin/sendmail only points to the first queue. 
> There isn't any way for this to selectively point to the second
> queue.  The only way to get mail injected to the second queue is by
> talking to port 25 on the ip address of the second instance.  Any
> mail generated from scripts will not work as expected.    
> 
> Sendmail will always use the base ip address when sending mail.  If
> there is a way to change this, I haven't been able to find any
> information online regarding this.  
> 
> Does this sound right?
> 
> Jim

You should have a complete config file for each instance of sendmail
that you are running.   I highly recommend the O'Reilly sendmail books.
I've found them invaluable for dealing with sendmail.  You might want to
take a look at the sections on routing mail in the sendmail Cookbook by
Craig Hunt.

You can pass a configuration file to sendmail using the -C command line
switch.  From glancing at some documentation it looks like there can be
some limitations when passing it a configuration file.  It's covered in
section 15.7.17 in the book sendmail by Bryan Costales, Third Edition.

Good Luck.

Aaron

-- 
Aaron Kent Moore
Information Technology Services
DeKalb Memorial Hospital, Inc.
Auburn, Indiana
Phone:  260.920.2808
E-Mail:  amoore at dekalbmemorial.com