Configuring the email POP collection limit

Configure->LocalConfig->FetchLimit

This setting determines the maximum number of emails that are collected from each internet POP server during any one connection.  The default setting is 'Unlimited', meaning all emails are collected.

When the Server collects email from a POP mailbox on the Internet, it normally collects each email in turn and deletes that email from the remote POP server as soon as it has been received.  With some POP servers however, the email is not actually deleted until after the TCP/IP connection to it is closed down. If the connection is abnormally terminated, rather than closed down correctly, this means that the emails will not be deleted at all, and duplicate copies will appear in the Users mailboxes after the next collection.

Where a dial-up connection is frequently subject to being dropped without warning, specifying the maximum number of emails to collect before closing down the connection can help.  If you suffer from duplicate emails, try setting this field to a reasonably low value, say between two and ten.