Disabling pop3 in Zimbra

It can be useful to disable the pop3 server entirely in Zimbra. This way you don't have to take pop3 attacks in to account any more. And users cannot move all their email to their own email client.

In this FAQ we used Zimbra 8.6+.
The deactivation needs to be done at two levels. The proxy has to be deactivated for pop3 and then the pop3 service itself needs to be deactivated in Zimbra. Both steps have to be done firstly in the global configuration and secondly on the server where the pop3 service is running.

Step-by-step plan to deactivate pop3 in Zimbra

If you have one single Zimbra server you can execute all the steps on your server. Make sure you execute your commands as a Zimbra user. Do this with:
su - zimbra.

On the first mailbox server

  • To deactivate the pop3 service in the global configuration:
    zmprov mcf zimbraPop3ServerEnabled FALSE
  • Now deactivate the pop3 proxy service:
    zmprov mcf zimbraReverseProxyMailPop3sEnabled FALSE
    zmprov mcf zimbraPop3ServerEnabled FALSE
  • Switch off the pop3 service for the current mailbox server:
    zmprov ms `zmhostname` zimbraPop3ServerEnabled FALSE

On multiple mailbox servers

If you use multiple mailbox servers, please execute the following command on each server:
zmprov ms `zmhostname` zimbraPop3ServerEnabled FALSE

On each proxy server

Deactivate the pop3 proxy for the current server:
zmprov ms `zmhostname` zimbraReverseProxyMailPop3Enabled FALSE
zmprov ms `zmhostname` zimbraReverseProxyMailPop3sEnabled FALSE



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