Zimbra Forums

I didn't have PROXY for IMAP and POP3 enabled, neither, nor NIO. Cause I tend to be an early adopter, every time there is a new ZMC version I rush to install it. And at one of the updates the NGINx PROXY and Memcached were mandatory. I enabled the proxy just for webmail not for IMAP, cause I didn't ...

Are You using NGINX proxy for IMAP? Is NIO for IMAP enabled? What is the output of this command: zmprov getConfig zimbraImapMaxRequestSize ?

Out of curiosity, Do the owners of the failing mailboxes use DAVdroid or K-9 mail client or some other software for email and calendar/task sync?

I increased the Imap services. It affects all accounts as the https page doesn't spawn. I am able to use the Jetty service 8443 as a workaround but would rather use the nginx server.[/quote] So you have problems with your zimbra proxy settings: Take a look at this: https://wiki.zimbra.com/wiki/Zimbr...

As written in the upgrade notes of zimbra the new IMAPD is BETA, e.g. It'll not be enabled after install. Never the less I chose the option not to install it at all. My server is a Supermicro one with 4 AMD processors with 12 threads each. Samsung EVO pro SSD and 64GB RAM, had no such issues on 8.7....

Does It occur to all the accounts or just to some of them. Check the /opt/zimbra/log/mailbox.log for some JAVA exceptions and some mailbox locks (not account locks). I have this problem after updating from latest in 8.7 series to 8.8.5. It happens to accounts that are heavily using IMAP (lots of fol...