Thanks, Scott. That was the enlightenment I needed. Of course, now I have to figure out what to do so that the test won't flag our own clients. The only solutions seem to be to either turn off the test (which would be a pity) or whitelist our clients. We don't have IMail 8.x, so we can't use the whitelist auth option. And I'm really hesitant to upgrade because our 7.15 version is so reliable, and IMail upgrades always seem to introduce a lot of new problems. We can't whitelist by IP, so the only choice would be to whitelist by domain name. But wouldn't that allow any spammer who forgets the from line with our addresses to slip through?
What a puzzle. Ben P.S. Thanks again for helping to finally understand. ----- Original Message ----- From: "R. Scott Perry" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, June 23, 2004 1:06 PM Subject: Re: [IMail Forum] handling CMDSPACE problem > > >I don't understand why John's message was unaffected by CMDSPACE, while my > >test messages (both in-office and from my home), using the same exact > >version of OE, failed the test. The only other difference that I can see is > >that our messages were internal to our server, whereas John's message (and > >the others) came from outside. > > That is exactly why. If anyone sending E-mail with Outlook caused the > CMDSPACE test to fail, it would be a useless test, since so many people are > using Outlook (I wouldn't be surprised if Outlook accounts for about 50% of > all E-mail). > > The key here is that Outlook doesn't connect to your server, a mailserver > does (except for E-mail from your users). So if I was running Outlook, > Outlook would do the odd thing that it does when connecting to the > mailserver here, but then when our mailserver sends the E-mail to you, the > E-mail won't fail the test, since our mailserver doesn't have this problem. > > The confusion arises since an MTA (IMail) can accept SMTP connections from > both other MTAs (for incoming E-mail) or MUAs (E-mails from users, normally > relayed to other MTAs, but can go to a local user). MTA to MTA > transactions very rarely fail the CMDSPACE test; it's the MUA to MTA > transactions that may fail when Outlook is involved (but for people with > IMail v8, can easily be solved by using WHITELIST AUTH). > > -Scott > --- > Declude JunkMail: The advanced anti-spam solution for IMail mailservers > since 2000. > Declude Virus: Ultra reliable virus detection and the leader in mailserver > vulnerability detection. > Find out what you've been missing: Ask for a free 30-day evaluation. > > --- > [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] > > > 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/
