Zimbra Open Source Edition 8.0 is installed on Ubuntu 12.04 LTS @ ESXi.
Everything works fine, but a heavy user gets "connection interrupted by the server" error on the Outlook. The mailboxd.log shows the following entry.
2012-10-18 10:53:37,828 WARN [Pop3Server-213] [ip=192.168.100.154;] pop - throttling POP3 connection for remote IP 192.168.100.154
Reverse proxy is not installed, and the minimum mail polling interval is set to 1 second for this user. Seen some attributes related to the proxy, but the proxy service is not enabled.
How can I disable the pop3/imap throttling or increase the allowance?
Thanks in advance.