Re: Unable to reach POP server

From: Bryan Linton (blinton_at_nospam.connellinsurance.com)
Date: 09/10/04 

Date: Fri, 10 Sep 2004 16:08:09 -0500

"Phillip Windell" <@.> wrote in message
news:uTncLPelEHA.1008@tk2msftngp13.phx.gbl...

> No. The users would simply use the Spam filter's SMTP service just as if
it
> was the regular mail server's SMTP. They would not know the difference.
It
> is up to the Spam Filter to be able to determine if they should be allowed
> to relay or not. The real mail server would never even see or touch the
> user's outbound mail. The message would simply go from the user mail
> client's "outbox" (Outlook Express?) to the Spam Filter's SMTP Service
where
> is is tested to see if it is spam, then tested to see if the user is
allowed
> to relay, and then it would be "relayed" directly to whereever it is
> supposed to be destined,...it would never get to nor touch the regular
mail
> server.

I don't think that'll work in our case, because our spam filter does not
relay mail back out to the internet, but only to explicitly configured
internal domain names mapped to internal IPs; in other words it only relays
to internal mail servers. Outgoing mail sent by our mail server is not
screened thru the spam firewall; our mail server sends it directly out. In
that case, since I have two types of incoming SMTP traffic (inbound mail
from internet mail servers, and users needing to relay their outgoing mail)
that need to be handled by two different devices, I think I need that SMTP
traffic to come in on two different ports. I obviously can't change the
port that other internet mail servers send us mail on, but I *can* change
the port WE use to communicate with OUR mail server. It simply means that
all devices that wish to establish a direct connection with our mail server
must do so on a specified nonstandard port. I have control over those
devices, which are my Outlook clients, and my spam firewall. If I configure
my mail server, spam firewall, and outlook clients with a common,
nonstandard port, I think that will allow me to set up port forwarding rules
to meet my needs.

I wrote that all out partly to clarify it in my own mind, and partly to have
someone besides myself check my logic. :-) Am I barking up the wrong tree,
or will that solve my problem?

If so, then there's just one more problem to solve...that of changing the
ports on all my clients. Hello, GPO.

Bryan

B

Relevant Pages

  • Re: Spam Hangs Outlook Express
    ... > least one spam that locks up Outlook Express. ... You may have to reset the mail server and port, the normal POP3 port is 110 ...
    (microsoft.public.windows.inetexplorer.ie6_outlookexpress)
  • Re: Spam
    ... >> My firewall logs indicate that a site in China is sending me spam packets ... delivered via UDP to port 1027) not email. ... spammer actually cares about return codes. ... and are just shoveling sh1t out to your mail server. ...
    (comp.security.firewalls)
  • Re: Current status?
    ... You would still need to know who your MTA is ... justification for allowing anybody to use port 25. ... to the problem of how to get the email system to be more immune to SPAM. ... your ISP should never allow you ...
    (comp.os.vms)
  • Re: content filtering
    ... opinion on experience that's limited to dealing with domestic US ... Considering that the large majority of spam originates from the US, ... Now all you need is some method of identifying the sender. ... 550 code would come to the attention of the mail server admin who could ...
    (microsoft.public.exchange.admin)
  • Re: anti spam sw?
    ... It only tags suspect mail as spam. ... Bayesian filtering should ALWAYS be the *last* mechanism used to detect spam since it is a guessing scheme based on word weigthing over a historical sample set experienced by just one particular user. ... I also use the MXblocking plug-in because I don't want mails sent from dynamically IP addressed hosts. ... If someone wants to operate their own mail server then let them get a static IP address. ...
    (alt.computer.security)