Hello,

I'm experiencing some problems with the IMAP connections. No matter, that the max threads are set up to 10000 once all of the employees are in the office (around 150 people) at some point the imap server is starting to drop some of the connections. All necessary settings are made in order Zimbra to serve our office, but still we are having issue. We are using Thunderbird on most of the workstations, if this have anything related to the issue. Thanks in advance

ps. Here is some greps from the mailbox.log also the configuration for IMAP is 10000 threads + 250 connections per IP
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2012-10-15 10:06:11,120 WARN [ImapServer-11] [] imap - Dropping connection (max connections exceeded)
2012-10-15 10:06:13,739 WARN [ImapServer-20] [] imap - Dropping connection (max connections exceeded)
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2012-10-15 10:11:33,020 WARN [ImapServer-3] [ip=XXX;oip=192.168.1.2;via=192.168.1.2(nginx/1.2.0-zimbra);ua=Zimbra/8.0.0_GA_5434;] imap - too many IMAP requests from original remote ip 192.168.1.2 dropping connection
2012-10-15 10:11:33,078 WARN [ImapServer-5] [ip=XXX;oip=192.168.1.2;via=192.168.1.2(nginx/1.2.0-zimbra);ua=Zimbra/8.0.0_GA_5434;] imap - too many IMAP requests from original remote ip 192.168.1.2 dropping connection
2012-10-15 10:11:33,136 WARN [ImapServer-2] [ip=XXX;oip=192.168.1.2;via=192.168.1.2(nginx/1.2.0-zimbra);ua=Zimbra/8.0.0_GA_5434;] imap - too many IMAP requests from original remote ip 192.168.1.2 dropping connection
2012-10-15 10:11:33,191 WARN [ImapServer-3] [ip=XXX;oip=192.168.1.2;via=192.168.1.2(nginx/1.2.0-zimbra);ua=Zimbra/8.0.0_GA_5434;] imap - too many IMAP requests from original remote ip 192.168.1.2 dropping connection