> > We have an increasing number of users who use various ISP's who > are blocking > port 25 traffic (ie earthlink, optonline, etc) > > Our mail servers require SMTP AUTH. > > I searched thru the archives and see discussions on port 587 and on > redirection at the router as a way to allow user of port 25 > blocked networks > send mail thru our server. > > If the user already uses AUTH, can I just instruct a user to change the > outgoing port from 25 to 587 in his mail client - this would seem to be a > simple solution (almost too simple) am I missing something here? > > If I need to resort to port redirection in a router, what > implications does > this have on smtp auth or other things. > The issue is how to get the server to accept connections on port 587, not how to get the client to contact the server on a different port.
You've got the client side solution. Just change the port in the client. On the server side, IMail can only be configured to listen on one port. Normally this is 25 to allow both other servers and clients to communicate. Changing the one port to 587 is not an option. Ideally, IMail would listen on both 25 and 587 accepting only AUTH connections on 587. Since Ipswitch hasn't provided a version that works this way, there has been an ongoing discussion in this forum about how to work around this problem. If your IMail server is behind a firewall that you can program, you've probably already set a port forward from 25 to 25 and all you need to do is add a 587 to 25 rule. If your IMail server isn't behind a firewall that you can program, there's a couple of free programs that you can use to listen on 587 and forward to 25. Neither of these workarounds limit the port 587 traffic to AUTH connections only. I believe there are some commercial programs that might work and/or one could write such a program. I'm happy with the firewall port forwarding solution. Regards, Brad Morgan IT Manager Horizon Interactive Inc. To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
