All you need to do is to enable it in the server-manager, just click on Email under the Configuration heading on the left hand side of the server-manager web page. Then forward the appropriate ports if you have a router between the server & the Internet. Remember that SME use secure POP, which uses port 995. Outlook, Outlook Express, Thunderbird & Apple Mail all support secure POP, so I imagine most other email clients do.
HTH
Peter
On a 7.4 server in server-only mode I have done this.
I did the port forword for external pop (995)
the name of the server is wrpcsrvr.
for internal clients we have to set pop to the ip of the server.
for eternal clients I keep getting a pop up message "the certificates' CN name does not match the passed value" do you want to continue.
If I say yes it lets me on, but happens every time we open OE.
the name on cert is wrpcsrvr.theirdomain.com.
I have tried importing cert, same result.
POP is set to 995 on advanced.
any help greatly appreciated.