I originally thought of that idea as well as moving the mail server to a new IP address, but coordinating that change with over 1000 users from 50 different businesses is simply not feasible.
I would really like to pull this off while maintaining industry standards and being transparent to the end users. Adam -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Don Brown Sent: Tuesday, December 27, 2005 2:57 PM To: [email protected] Subject: Re: [IMail Forum] Identifying Authenticated User Emails Have your users authenticate on Port 587 for SMTP and change your firewall to only allow Port 25 traffic to your Proxy. I'm not sure which version of Imail includes Port 587 for SMTP Auth. We're running 8.22 and it is included in that release. Tuesday, December 27, 2005, 11:23:45 AM, Adam Winter <[EMAIL PROTECTED]> wrote: AW> I'm using version 8.05 and the spam filtering capability of that AW> version is becoming ineffective even with the Anti-spam updates. I AW> have put in place a 3rd party spam server proxy which incoming email AW> gets sent through for filtering and then relays to the Imail server. AW> The spam filter does subject modification, so in Imail I use a rule AW> to check for either the X-header from Imail or the modified subject AW> to determine if it should go to spambox or not. AW> Here's the problem. After changing the MX record, spammers are AW> still sending email directly to the Imail server because they either know it AW> already exists, or their DNS servers cache the old MX record forever. I AW> can't shutoff access to Imail's external IP address, because AW> legitimate users of about 100 domains still go there to send their AW> email and require SMTP access. AW> Solution (in theory): I need an Imail rule which either detects the AW> presence of the spam filter proxy's IP address in the header (easy) AW> or can tell if the email was sent by an authenticated user AW> (impossible, as far as I know). Any email other than those 2 AW> exceptions would be classified as spam because they didn't go AW> through the proper channels. In effect, no email would be received AW> by users by sending it directly to the Imail server. The problem is AW> that users of one domain could not email users of another domain AW> hosted on the same server because they didn't go through the spam proxy, nor can authentication be determined. AW> So, I'm wondering if 1 of 2 options exist: AW> 1. Can authenticated email be identified somehow with a rule? AW> 2. Can an X-header be inserted on outgoing email? AW> Thanks for any ideas! AW> Adam AW> To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html AW> List Archive: AW> http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ AW> Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ ---- Don Brown - Dallas, Texas USA Internet Concepts, Inc. [EMAIL PROTECTED] http://www.inetconcepts.net (972) 788-2364 Fax: (972) 788-5049 ---- 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/
