Ok good thanks for all the info everyone.

J. Carl Wagar
EntreNet Communications Inc
www.entrenet.com  www.thehostingservice.com 
24 Swain Ave, Ottawa, ON, K1G 4T1, Canada
Email: [email protected], skype: jcwagar
Tel: +1 613-737-7327, Fax: +1 613-737-5801
Cel: +1 613-818-8898

-----Original Message-----
From: [email protected] [mailto:[email protected]] On 
Behalf Of Andy Schmidt
Sent: Tuesday, July 2, 2013 1:09 PM
To: [email protected]
Subject: [MBF]Re: anti-spam solutions for ms-exchange

You can. Recent versions offer a gateway feature:
http://docs.ipswitch.com/_Messaging/IMailServer/v12/Help/Admin/index.htm?13627.htm

Prior to that, you had to use aliases...

Of course, the concerns are dictionary attacks if your gateway does NOT have a 
list of valid email addresses to be able to drop connections on attackers.

(There are scripts that will poll the Exchange Server using LDAP twice an hour 
to obtain a list of valid email addresses to validate against - this is how I 
use ORF to front-end Exchange Servers)

-----Original Message-----
From: [email protected] [mailto:[email protected]] On 
Behalf Of Carl Wagar
Sent: Tuesday, July 02, 2013 12:53 PM
To: [email protected]
Subject: [MBF]Re: anti-spam solutions for ms-exchange

Ok thanks for the hint.
I would have thought I could just relay the whole domain (rather than setting 
up mailboxes?), after filtering is applied (assuming I set up the MX record in 
the DNS to point to the imail server with say, priority 10 and the real server 
with priority 15 ?) and then have Imail forward all messages for that domain to 
the exchange server, presumably after declude/sniffer runs.
Will look into it.
Thanks.
Carl



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