What Mail Server Do The Fortune 100 Companies Use?

Ever wonder what mail servers the top U.S. companies run? I found myself wondering what the top universities used a while back, and I just recently got curious as to what the Fortune 100 companies used as well. The results were quite interesting; it’s always fun to see what some of these admins put in their mail banners:

220 plgmler2.imr.gm.com ESMTP Sendmail GM Secure; Thu, 17 Aug 2006 23:23:21 -0500
220 mail11.disney.com Postfix EGGS and Butter 
220 IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted
220 Medco - Ready 220 mailgate2.safeway.com ESMTP ***** SMTP Ready *****
220 mail1.cat.com ESMTP Microsoft Exchange Internet Mail Service 5.5.2657.72) ready
220 Northrop Grumman Corporation Ready
220 mms01bas.mms.us.syntegra.com (IntraStore TurboSendmail) ESMTP Service ready
220 [12.43.78.22] ESMTP
220 wamu.com Proxy Server 220 fdsmail01.fds.com Microsoft ESMTP MAIL Service, Version:
5.0.2195.6713 ready at Fri, 18 Aug 2006 00:31:58 -0400

Quite a few of the banners warn anyone reading not to use the service for spam, although I have to wonder whether or not a spammer has ever changed their behavior due to a warning like this.

We also get to see some personality in the way the servers say goodbye (SMTP 221):

221 Bye
221 Until later [69.214.242.13]
221 Catch you later

Anyway, here are the complete results as well as the stuff I used to run the test:

Input

The Script The Company File

Output

The Complete Banners The Exit Messages

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** Note: There’s a fine line between being curious about interesting service banners and portscanning. If you don’t know what that difference is then you probably shouldn’t be doing this at home. :)