Thank you for the reply Scott.
Here's the SMTP Security Settings:
Mail Relay Options:
Relay mail for 192.168.0.0/24
Checkbox fields:
[x] Allow remote mail to local groups
[x] Allow remote view of local groups
[x] Refuse Null <> Senders
[x] Check valid sender
[x] Auto-deny possible hack attempts
[x] Disable SMTP "VRFY" command
[ ] Disable SMTP "AUTH" reporting
And a quick check of the log files seems to be showing me an IP address
from the front-side that's being handed out by the IMail server for a
domain with a completely different IP address. I can't replicate this
from any DNS server I've tried, so I'm going to be buddies with RFC
2821, a port scanner, and DNS to see why this is happening.
TTYL
---------- Original Message ----------------------------------
From: "R. Scott Perry" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Date: Mon, 18 Mar 2002 18:35:52 -0500
>
>>My server is not setup to be an open relay. It does conditional relay
>>based on valid user.
>
>That means that it IS an open relay (I'm assuming you are using the "Relay
>for local users" option). Any spammer in the world can send as much
E-mail
>as they want if you use the "Relay for local users" option.
>
>>Have plenty of smtp security features enabled (even the relay based on IP
>>addresses.
>
>Are you using "Relay for local users" ("conditional relay based on valid
>user"), or "Relay for addresses"? Only one can be used at a time. If you
>use "Relay for addresses" (or "No mail relay"), you're as safe as you
can be.
>
>>The error clients recieve from the Imail postmaster is:
>>Date: Mon, 18 Mar 2002 15:02:48 -0700
>>To: <[EMAIL PROTECTED]>
>>Subject: Undeliverable Mail Unknown user: [EMAIL PROTECTED]
>
>If you check your IMail log file (probably \IMail\spool\SYS0318.txt) at
>around 15:02, you should see the E-mail, along with the reason for
>non-delivery that excite is giving. It might, for example, say "550-
>[EMAIL PROTECTED] doesn't accept any E-mail from domains beginning
with
>the letter 'c'" (a silly example, but usually the message provides a clue
>as to the problem).
>
> -Scott
>---
>Declude: Anti-virus, Anti-spam and Anti-hijacking solutions for
>IMail. http://www.declude.com
>
>---
>[This E-mail was scanned for viruses by Declude Virus
(http://www.declude.com)]
>
>
>Please visit http://www.ipswitch.com/support/mailing-lists.html
>to be removed from this list.
>
>An Archive of this list is available at:
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>
>Please visit the Knowledge Base for answers to frequently asked
>questions: http://www.ipswitch.com/support/IMail/
>
Please visit http://www.ipswitch.com/support/mailing-lists.html
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