I am not sure if Exchange can be configured to listen on 587 in addition to 25, but it is accepting inbound authenticated connections is what you meant. A work around (as long as your Exchange server is properly configured) is to add an inbound rule to your firewall (you are running a firewall aren't you) to redirect incoming port 587 traffic on the external interface to port 25 on the internal destination. John T eServices For You -----Original Message----- From: EIS Lists [mailto:eis_lists@xxxxxxxxxxxxx] Sent: Thursday, September 15, 2005 2:54 PM To: [ExchangeList] Subject: [exchangelist] Authenticated Outgoing Mail http://www.MSExchange.org/ Hello: We have several users who access their Exchange accounts via POP and SMTP. Recently, several large ISPs have started blocking outbound traffic that does not use their servers. Is there a way to tell Exchange 2000 to use authenticated outbound connections (e.g., over port 587)? Thanks. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: johnlist@xxxxxxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx