>Thanks again for your comments. Yes, I have SBS2000 on the same server as
>IMail is on (using both the Firewall and Proxy Server).
OK -- in that case, it seems that SBS2000 is poorly designed, in that it
passes on the host name of the remote server, but not the IP
address. Unless they have a fix for it (adding a Received: header with the
correct information), you'll have to accept it, with the drawback being
that it will be hard (or impossible, depending on the SBS2000 logs) to
track the source of E-mails.
>IMail's SMTP port is 26 (using port 25 for the SBS SMTP port).
That is fine.
>I can change the port for both
>SMTP servers, but I'm wondering why I would need to do this - do they not
>resolve themselves automatically? And why would we have the option of
>deciding which port to use if I can only use default port 25?
There is no resolving necessary, and you don't need to change the ports.
The problem is that SBS2000 passes the connection on to IMail, but since
they are running on the same server, IMail sees the address as 127.0.0.1
(localhost). That isn't unusual -- most SMTP-based virus scanners work
that way. But, the problem is that SBS2000 doesn't add a Received: header
with the remote mailserver's IP (which those SMTP-based virus scanners will
do).
So to answer your original questions:
> Who is the real sender?
It is impossible to say without reviewing the SBS2000 logs. If it were
adding a Received: header, you could simply look at the second Received:
header.
> And how do I block them?
You would really need to block them with SBS2000, since it is hiding the IP
from IMail. Another option would be to block their return address, using
IMail's SMTP "Kill File" security setting.
-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:
http://www.mail-archive.com/imail_forum%40list.ipswitch.com/
Please visit the Knowledge Base for answers to frequently asked
questions: http://www.ipswitch.com/support/IMail/
