The way I handle it here works for me, but may not be the best solution... Our Barracuda and IMail server both reside within our DMZ.
The firewall is set to send all port 25 traffic for our outside MX record to xxx.xxx.xxx.001 within the DMZ (Barracuda) All port 110 traffic is aimed at xxx.xxx.xxx.002 (IMail). I used to have our IMail server set as MX20, but we were being flooded with SPAM thru that conduit. I still have a MX 20 record, but we have commented out the NAT statement in the firewall. In the event the Barracuda dies, we will manually add the NAT statement for the IMail server. This has worked well for us for about a year - our situation is a bit different, we are a corporate user with all of our locations linked by WAN or VPN connections. Outside users either VPN to us or use webmail. Art McNamara Network Engineer Jernberg Industries, Inc. 773-326-4867 Voice 773-326-4967 Fax -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Grant Griffith - IMail Sent: Friday, March 11, 2005 7:33 AM To: [email protected] Subject: [IMail Forum] Need Help Preventing Connections Hey All, We have a Barracuda Firewall in front of our Imail server and I want to setup Imail so that only Authenticated users and the Barracuda can connect to Imail and send messages. How do I go about setting this up in Imail? Do I need to Deny Access to everyone except my barracuda in the Control Access area in SMTP security? Does that still allow my users to authenticate and send messages? Thanks all for any help. I am just trying to stop all the DOS Attacks we have been getting. Thanks, Grant Griffith EI8HT LEGS, A Division of ETC (877)483-3393 (812)933-5390 To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
