Find out the protocol and port used to receive emails from your email server.
Default values are given below (for MS Exchange Server):
SMTP - 25 (Only for Sending Emails)
POP3 - 110
IMAP - 143
POP3s - 995 (SSL)
IMAPs - 993 (SSL)
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You can verify connectivity by using TELNET command from a command prompt
syntax: telnet email_server_host PORT
e.g. telnet myserver.exchange.com 110
If you succeed with the above command, you can use the same values to configure email endpoint.
Nith