Remote Exchange Server, Incoming EMail, and Ports

When an organization access an external (i.e. third party) Microsoft Exchange Server for their email and uses MS Outlook 2003/2007 email clients locally (with Calendar Sync), does the incoming email still use the standard POP3 port of 110 ? Or does it use some other port(s) instead of or in addition to port 110 ? A site needs to configure an edge router or firewall device of some sort to effectively scan incoming emails - and on occassion strip certain attachment types.  

TIA ...
LGroup1Asked:
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CuteadderCommented:
if its an exchange connection, I think it uses TCP port 587...
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RyanShaferCommented:
Incoming email will typically arrive on port 25 as smtp traffic.  pop3 port 110 would be the port your mail client uses to pull the mail from the server.
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LGroup1Author Commented:
Yes, the Exchange server is actually hosted by a third party outside of the organization and the internal clients (for this smalll company)  are MS Outlook - so typically it would be POP3 at that stage. I am just not sure if MS Exchange along with MS Outlook use other ports given the additional functionality available (e.g. Calendar Sync, etc...).

Thanks,
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LGroup1Author Commented:
Perfect, thanks !
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