Outlook Ports w/Exchange 2000

[gofast]

I have remote sites that are running Outlook 2000
connecting back to an Exchange 2000 server. The ISP
supplying DSL to the remote sites has warned me that they
are going to shutdown port 25 and force all users to Web-
based mail.

Do Outlook 2000 clients connecting back to an exchange
server use port 25 or is it only 135-139, 444?

 

[Roady [MVP]]

SMTP is 25. You can also connect by VPN and use an exchange connection
instead of POP3/IMAP with SMTP

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[Lanwench [MVP - Exchange]]

The remote sites don't need inbound port 25 open....that's for SMTP
communication.

You should be using VPN for the remote sites - preferably a site-to-site VPN
via identical firewalls that can handle it (I like Sonicwall) - I hope you
don't have 135, etc., open in your firewall from the Internet, or you most
likely already have uninvited guests on your network.

 

[Guest]

I have all the clients configured to use the Exchange
Server connection instead of POP3/IMAP. Does this
connection ina any way use port 25 SMTP?

 

[Lanwench [MVP - Exchange]]

Port 25, and SMTP, has nothing to do with the MAPI connection you want to
make. As Roady and I both suggested, VPN is the way to go. Your network
can't be secured much if you're allowing Outlook to connect directly to the
Exchange server over the Internet.

 

[Brian Tillman]

Do Outlook 2000 clients connecting back to an exchange
server use port 25 or is it only 135-139, 444?

They can, if they connect via a POP/SMTP account, but not necessarily and
not typically. They can also use port 143 (for an IMAP connection), but
this also is atypical.