Re: [UUG/MLUG] Hacking sendmail for home system over dial-up

[Jason Carroll <EMAIL:PROTECTED>]

On Thu, 7 Jan 1999, Rich Tollerton;; wrote:

> On Wed, 6 Jan 1999, Paul Saab wrote:
> 
> > set your DM macro or use MASQUERADE_AS m4 macro in your macro file.
> > 
> > # who I masquerade as (null for no masquerading) (see also $=M)
> > DMtranquility.net
> 
> Tried that.. works good on localhost and tranquility mail, but showme
> won't accept accept it. It reports a "data format error", but in reality
> it's still trying to look up the nonexistent hostname. I can attach the
> exact error mail message to the list or provately if anybody wants, it's
> 40-ish lines long.


Masquerading only solves half your problem.  It does translate all your
from addresses for you the way you want, but when your sendmail connects
to the remote machine, it still reports its hostname as the mail relay,
and that is what most relay filters look up (at least the ones that
control mail relaying and reverse DNS, you can also do reverse DNS on the
FROM address itself, but masquerading has solved that SPAM problem for
you).  What you really need to do to get around the relay and rev DNS
lookups is to relay all your mail through tranquility.  

As far as I know there are 2 ways to do this in sendmail.  The first is
through the use of the nullclient for mail delivery.  This forces all mail
that leaves the server to go to the remote machine defined, however I
think there are problems with this if you want to run a sendmail daemon on
port 25 to accept mail.  If you dont' care about this you can turn it on
with the m4 macro:

FEATURE(nullclient,tranquility.net)

The other way (which I'm not very familiar with and have never used) is to
actually set the a relaying feature.  The one you probably would want is
the SMART_HOST relay.  I think it works something like:

define('SMART_HOST', 'smtp:tranquility.net.')

I think you need to last dot on tranquility.net to say this is the end of
the relay name.  

We use nullclient on showme to relay all mail from from our client nodes
to the main mail server for delivery and it has worked well for the past
2-3 years.

Jason

-- Jason Carroll                | IATS Systems and App Group  615 Locust St. 
-- EMAIL:PROTECTED | Phone: 882-2000             Fax: 884-5240