http://blogs.technet.com/smsandmom/archive/2008/03/27/opsmgr-2007-email-notification-to-external-email-address-fails-with-error-31500.aspxWe've seen this problem crop up a few times here recently so I thought a heads-up was in order. Hopefully if you use external email addresses in your notifications you haven't run into this issue but if you have this may be a solution: ======== Problem:en-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/smsandmom/archive/2008/03/27/opsmgr-2007-email-notification-to-external-email-address-fails-with-error-31500.aspx#3024347Mon, 31 Mar 2008 14:44:05 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3024347SMS&MOM : OpsMgr 2007: Email notification to external email address fails with error 31500 | System Center Guide<p>PingBack from <a rel="nofollow" target="_new" href="http://systemcenterguide.com/2008/03/31/smsmom-opsmgr-2007-email-notification-to-external-email-address-fails-with-error-31500/">http://systemcenterguide.com/2008/03/31/smsmom-opsmgr-2007-email-notification-to-external-email-address-fails-with-error-31500/</a></p>