Exchange 2003 can listen for SMTP connections on any port or ports. I would expect the same capability in E2K. _____ From: John Tolmachoff (Lists) [mailto:johnlist@xxxxxxxxxxxxxxxxxxx] Sent: Thursday, September 15, 2005 6:09 PM To: [ExchangeList] Subject: [exchangelist] RE: Authenticated Outgoing Mail http://www.MSExchange.org/ 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.