Re: SBS 2003 - Exchange SMTP - send mail by DNS

From: David Elders (david_elders_at_hotmail.com.nospam)
Date: 03/09/05 

Date: Wed, 9 Mar 2005 23:51:13 -0000

Hi Javier,

Point taken about simply using smarthost for all outgoing mail being
simpler.

Re-read my posting and yes, a bit jumbled sounding! :-) Let me clarify...

We were happy using DNS to send directly out from our Server [as it kept us
in control and removed an external factor in terms of our ISPs mail servers]
but as more and more ISPs and/or recipients use either automated blacklists
that bounce dynamic IP addresses [even those that are in effect static such
as ours] and/or reverse DNS checking [that would resolve to our ISP instead
of to us - because we run POP3 mail...], we're being forced into one of 2
set-ups:

1] Use Smarthost for ALL our outgoing mail, which means that any problems at
our ISP become our problem in terms of sending mail outwards...

or

2] Change from POP3 mail to SMTP mail and have our DNS set-up to resolve to
our own Server on [our soon-to-be static IP address - once we change from
cable modem to ADSL shortly...]. Then send all mail out via DNS.

That's kinda what I meant by the circumstances dictating what path we are
having to take. Not a major gripe as such as I've always intended shifting
us over to SMTP in any case but would have preferred it to be on our terms
and timescale rather than it being necessitated by external factors.

But yes, in relation to the original posting - simply using a Smarthost for
all outgoing mail would be simplest.

Thanks for the pointers as always!

Cheers,

David

"Javier Gomez [SBS MVP]" <javier_gomez@REMOVE.THIS.engineer.com> wrote in
message news:%23go7vGNJFHA.2628@tk2msftngp13.phx.gbl...
>> Simplest way around is to add another SMTP connector which uses your ISP
>> as a relay. In the Address Space area of the properties for this
>> connector, add a new SMTP entry for the aol domain. Ditto for any other
>> recipients who are knocking back email for similar reasons.
>
> I have to respecfully disagree with David here... simplest way is to stop
> using DNS and switch to smarthost for all domains.
>
>> We send via DNS as standard but have another SMTP connector set-up to
>> relay via our ISP with about 20 domains in there that we were having
>> bounce messages from. Getting more and more common these days [we're
>> currently on dynamic - although constantly refreshed so in effect
>> static - IP address on our cable modem - about to move to ADSL with a
>> static IP].
>
> Exactly my point... in my opinion there are too many ISPs blocking dynamic
> IPs, etc. nowadays to use DNS in those cases. I have a lot of work with my
> SBS boxes... I don't want to add the burden of mataining a list of
> "problematic" domains for which I have to create a specific connector.
>
>> Not just dynamic/static IP addressing will get these similar bounce
>> messages. If you're running POP3 mail and sending via DNS, anyone doing
>> reverse DNS checking will also likely bounce mail from you and require
>> you to send via your ISP.
>>
>> PITA as we're not a relay or a spammer and its kinda forcing us away from
>> our [current choice of] POP3 and having our ISP host our mail to having
>> to host it ourselves on a static IP. I know all the arguements to and fro
>> about POP3 v SMTP but would prefer to have the choice to opt for one or
>> the other based on our requirements rather than being in effect forced
>> to... way of the world I suppose and we'll just have to go with it...
>
> I'm not sure what you mean here... what does POP3 mail or switching from
> POP3 to SMTP has to do with this issue? Why are you forced either way?
>
> --
> Javier [SBS MVP]
> www.msmvps.com/javier
> << SBS ROCKS!!! >>
>

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