I'm a little desperate with this problem with the IMAP service.
Here the log of the mailbox.log
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cat /opt/zimbra/log/mailbox.log | grep dropping
2018-01-21 19:15:45,329 INFO [ImapSSLServer-5]  imap - dropping connection for user email@example.com (LOGOUT)
2018-01-21 19:15:45,699 INFO [ImapSSLServer-4]  imap - dropping connection for user firstname.lastname@example.org (server-initiated)
2018-01-21 19:15:45,703 INFO [ImapSSLServer-6]  imap - dropping connection for user email@example.com (LOGOUT)
And so on... I have almost 1200 mailboxs. The system works, I can receive and send, but for some strange reason, in the server log it throws me those drop or dropping connection!!!
I made some adjustments in the server to see if this changed, but without good results, the connection is maintained for a short time, but after a while, it makes the drop of the users
These are the adjustments that I made:
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zmprov mcf zimbraHttpDosFilterDelayMillis 0
zmprov mcf zimbraHttpDosFilterMaxRequestsPerSec 100000
zmprov mcf +zimbraMailTrustedIP [ip]
zmprov mcf +zimbraHttpThrottleSafeIPs [ip]
zmprov ms `zmhostname` +zimbraHttpThrottleSafeIPs [ip]
zmprov mcf zimbraReverseProxyUpstreamReadTimeout 3600s
zmprov ms `zmhostname` zimbraLmtpNumThreads 40
zmprov ms `zmhostname` zimbraHttpNumThreads 500
zmprov ms `zmhostname` zimbraImapNumThreads 1500
zmprov ms `zmhostname` zimbraImapMaxConnections 40000
I also have rspamd installed, I followed a guide that was in this same forum.
PLEASE i need a little help to solve my problem, I will be eternally grateful if someone can help me! thank you very much.
My best regards.