http://msmvps.com/blogs/kwsupport/archive/2009/02/16/sbs2008-and-pop3-imap4-clients.aspxEnabling SBS 2008 to allow remote users to use their email clients (Outlook, Outlook Express, etc.) or phones to pull down email from the SBS2008 server via POP3 or IMAP4 is just slightly more involved than on SBS 2003. For all the step-by-step detailsenCommunityServer 2008.5 SP2 (Build: 40407.4157)http://msmvps.com/blogs/kwsupport/archive/2009/02/16/sbs2008-and-pop3-imap4-clients.aspx#1714352Sat, 08 Aug 2009 18:58:39 GMTd67277c4-116b-43f1-b688-e9ef184ea916:1714352Tony Paletti<p>I am able to relay mail from external client to internal email address only; &nbsp;if I try to relay email to an i.e user@hotmail.com address, I get this error: 550 5.7.1 Unable to relay. &nbsp;Any clues? &nbsp;Thanks in advance!</p> <div style="clear:both;"></div><img src="http://msmvps.com/aggbug.aspx?PostID=1714352" width="1" height="1">