CyberGuard SG300 User Manual page 179

If most, but not all, of your internal email clients are retrieving email from a single mail
server, enter this as the Default POP server. Check Allow connections to other POP
servers.
If there is no single mail server from which most of your internal email clients are
retrieving email, leave Default POP server blank and check Allow connections to
other POP servers.
Note
For each of the email clients that is not retrieving email from the default POP server (this
may be all email clients), the email client's POP (or POP3) username setting must be in
the form of user@mail.isp.com, rather than simply user – user is the POP login, and
mail.isp.com is the POP mail server.
Typically it is not necessary to adjust the POP protocol Request timeout.
Once POP scanning is functioning properly, you may choose to Reduce syslog output.
Click Submit.
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Firewall