OT: Multiple Outgoing IPs?

Paul Kelly :: Blacknight paul at blacknight.ie
Mon Apr 2 22:03:08 IST 2007

Jim Coates wrote:
>> -----Original Message-----
>> From: mailscanner-bounces at lists.mailscanner.info 
>> [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf 
>> Of Paul Kelly :: Blacknight
>> Sent: Monday, April 02, 2007 2:31 PM
>> To: MailScanner discussion
>> Subject: Re: OT: Multiple Outgoing IPs?
>> Jim Coates wrote:
>>> Hey gang...
>>> This is totally off-topic, but I know there are some very smart 
>>> individuals here who might have some ideas for me.
>>> The company I work for recently purchased another company (both 
>>> companies are very small).
>>> 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.
>>> Ideally, I don't want to add another mail server and would 
>> like to be 
>>> able to take advantage of all the filtering and such that I have 
>>> enabled on the existing *nix based mail server.
>>> I've been told that it is not possible to set outgoing IPs in 
>>> SendMail, so I'm looking for suggestions of how I might be able to 
>>> make this work.
>> Could you explain a little bit more as to what you need? I'll ask a 
>> question or two so I can clarify what I think you want to do.
>> You have an existing scanning machine where domain1.com 
>> lives, is that 
>> correct?
>> You want domain2.com to have its inbound e-mail sent to this box and 
>> have it delivered onto another mailserver by IP address, is 
>> that correct?
>> If you could answer that, I'll see what might work for you.
>> Paul
> Paul,
> Here is exactly what I need:
> Domain one and domain two both already come inbound to the same box via
> unique DNS mail records that both point to the same IP.  SendMail is
> currently configured to accept both domains and route them to local users
> (which is exactly how I want it to work on that end).
> I don't need to relay to another box, what I am looking to do is take mail
> originating from the mail server and send it outbound from a different IP.
> For example, if I send an email to you as "jim at domain.one" it will come from
> one IP address.  If I send you an email as "jim at domain.two", I want it to
> come from a different IP address.
> I have multiple public IPs available to my box, I just don't know if its
> possible to configure SendMail to always associate a particular outbound
> domain with one IP and another outbound domain with another IP.
> Does that make sense?
> What we are trying to do is separate out the email so that bonded sender
> information for one domain is not affected by the bounces and such from
> another domain.
> Thanks,
> Jim

I don't think you'll get the job done with 1 box. Adding a Xen instance 
for the second one would be trivial enough to do with the current box. 
Depending on which distro that is. Both ubuntu and debian would probably 
be the easiest to work with :)

Possibly having 2 MTA's would work each bound to a specific IP address 
as apposed to them listening on all IP's the way it defaults.

You could probably make that work, ymmv though.


Paul Kelly
Technical Director
Blacknight Internet Solutions ltd
Hosting, Colocation, Dedicated servers
IP Transit Services
Lo-call: 1850 927 280
DDI: 059 9183091

e-mail: paul at blacknight.ie
web: http://www.blacknight.ie

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