RE: Remote access filter blocks

[Paul Emerson <paul_at_gta_dot_com>]

The GNAT Box email proxy only speaks SMTP.  In fact it only supports 
the following commands needed to deliver email:

HELO
MAIL FROM
RCPT TO
DATA
QUIT

The specs say that if the sender connects with an ESMTP request and 
it is refused the sender should drop back to SMTP.

This email proxy was designed to be simple, safe and secure.  This 
basic code for the email proxy is something we've been using since 
1994.

As for MAPS rejections, some of the sites (like ORBS) are rather 
proactive and often over zealous.  We typically use the two Vixie 
sites.

Paul


> Send postings to: gb-users_at_gta_dot_com
> Access the list archives at:
> http://www.gnatbox.com/gb-users/
> ----------------------------------
> Joe (or anyone else using MAPS),
>
> Have you had any "good" mail rejected by MAPS?  I have not decided if I am
> going to enable it or not and some real world assurances that it did not
> block appropriate mail would be useful.
>
> Also to everyone else.  I have no problem using the gnatbox mail proxy to
> forward mail to my exchange server running the internet mail connector.  But
> if I try to forward mail to the IIS4 SMTP service (which is the proxy I used
> before gnatbox)  I get a 501 error from the gnatbox proxy when it tries to
> connect the the SMTP service.  I can connect to the smtp server directly:
>
> 220-mayim.galactic.com Microsoft SMTP MAIL ready at Thu, 9 Mar 2000 08:11:24
> -05
> 00 Version: 5.5.1877.197.19
> 220 ESMTP spoken here  
>
> Does gnatbox refuse to connect to ESMTP?  (I do not user any extended
> features)
>
>
> David Abrams
> Galactic Industries Corp
> dea_at_galactic_dot_com
>
>
>
> -----Original Message-----
> From: Joe Biniskiewicz [mailto:joeb_at_joeb_dot_com]
> Sent: Wednesday, March 08, 2000 5:49 PM
> To: GB Users
> Subject: Re: Remote access filter blocks
>
>
>
> *	I do have a local mail server behind the GB, and it is properly
> configured and operational, using the SMTP Relay feature of GB 3.0.2 as well
> as three RBL's.  I check the logs every morning to determine which hosts
> were denied from sending mail to me.  I use VisualRoute to trace to their
> SMTP server and do a quick lookup on their domain and host names.  I monitor
> this closely to be sure that no "good" mail was rejected via MAPS, and if it
> was, I stop using that RBL.  After all, it is better to let ten guilty men
> go free rather than to convict one wrongly.  Once I have performed that
> morning ritual, I put down my cup of coffee and get to work.
>
> ----------------------------------------------
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