SMTP Traffic Routing

SMTP Traffic Routing
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Subject Author Date
SMTP Traffic Routing DigitalKid 01-20-2007
Posted by DigitalKid on January 20, 2007, 5:05 pm
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Hello All,

I am wondering if anyone knows of a way to Route all outbound SMTP
traffic through a specific IP address. Here is the Scenario:

I have a SonicWall with enhanced OS. It of course has a WAN IP address.
It also has 2 IP addresses associated with the OPT port for public
servers. I recently changed the IP address of my mail server from
public to private. What i am looking to do is tell the SonicWall to
take any SMTP (Or all traffic if that is easier) and send it out of one
of the IP addresses associated with the OPT interface.

The reason for my doing this is that the MX record is pointed to one of
the IP addresses of the OPT port. If I send mail out and it goes out of
the IP that is associated with the WAN port (Different than the OPT IP)
it is categorized as SPAM as the MX reverse look up is bad.

If anyone can provide any opinions or solutions it would be greatly
appreciated.

Thanks,

Jason


Posted by Ansgar -59cobalt- Wiechers on January 20, 2007, 6:20 pm
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> The reason for my doing this is that the MX record is pointed to one
> of the IP addresses of the OPT port. If I send mail out and it goes
> out of the IP that is associated with the WAN port (Different than the
> OPT IP) it is categorized as SPAM as the MX reverse look up is bad.

Tell whoever is doing this to stop being an idiot. The MX is the host
supposed to *receive* mail. The MX record doesn't say anything at all
about which host is sending out mail from this domain.

cu
59cobalt
--
"If a software developer ever believes a rootkit is a necessary part of
their architecture they should go back and re-architect their solution."
--Mark Russinovich

Posted by Robert on January 20, 2007, 11:21 pm
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On Sat, 20 Jan 2007 23:20:28 +0000, Ansgar -59cobalt- Wiechers wrote:

>> The reason for my doing this is that the MX record is pointed to one
>> of the IP addresses of the OPT port. If I send mail out and it goes
>> out of the IP that is associated with the WAN port (Different than the
>> OPT IP) it is categorized as SPAM as the MX reverse look up is bad.
>
> Tell whoever is doing this to stop being an idiot. The MX is the host
> supposed to *receive* mail. The MX record doesn't say anything at all
> about which host is sending out mail from this domain.

If I understand what you are saying, I can only ask......
Are you for real?


--

Regards
Robert

Smile... it increases your face value!


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Posted by Volker Birk on January 21, 2007, 1:40 am
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> On Sat, 20 Jan 2007 23:20:28 +0000, Ansgar -59cobalt- Wiechers wrote:
> >> The reason for my doing this is that the MX record is pointed to one
> >> of the IP addresses of the OPT port. If I send mail out and it goes
> >> out of the IP that is associated with the WAN port (Different than the
> >> OPT IP) it is categorized as SPAM as the MX reverse look up is bad.
> > Tell whoever is doing this to stop being an idiot. The MX is the host
> > supposed to *receive* mail. The MX record doesn't say anything at all
> > about which host is sending out mail from this domain.
> If I understand what you are saying, I can only ask......
> Are you for real?

Ansgar is right.

Please read RFC 974 / STD 10.

Yours,
VB.
--
"Pornography is an abstract phenomenon. It cannot exist without a medium
to propagate it, and it has very little (if anything at all) to do with sex."
Tina Lorenz
<https://events.congress.ccc.de/congress/2006/Fahrplan/events/1422.en.html>

Posted by Ansgar -59cobalt- Wiechers on January 21, 2007, 8:29 am
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> On Sat, 20 Jan 2007 23:20:28 +0000, Ansgar -59cobalt- Wiechers wrote:
>>> The reason for my doing this is that the MX record is pointed to one
>>> of the IP addresses of the OPT port. If I send mail out and it goes
>>> out of the IP that is associated with the WAN port (Different than
>>> the OPT IP) it is categorized as SPAM as the MX reverse look up is
>>> bad.
>>
>> Tell whoever is doing this to stop being an idiot. The MX is the host
>> supposed to *receive* mail. The MX record doesn't say anything at all
>> about which host is sending out mail from this domain.
>
> If I understand what you are saying, I can only ask......
> Are you for real?

Yes.

However, if the OP must work around this he might try configuring the MX
as the smarthost for his clients/MTAs and have the SonicWall send out
all traffic from the MX on the OPT interface (if possible, I'm not
familiar with SonicWall or the OP's network).

cu
59cobalt
--
"If a software developer ever believes a rootkit is a necessary part of
their architecture they should go back and re-architect their solution."
--Mark Russinovich

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