If your Zimbra (pop3) only valid after entering TLS mode, Then you need to enable “Pop3CleartextLogin” through below steps.
Step1. Log in admin console, and go through global setting-> pop tab, here check the option ‘zimbraPop3CleartextLoginEnabled’.
OR
Step2. In cli mode perform the below command.
#su zimbra
#zmprov mcf zimbraPop3CleartextLoginEnabled TRUE
#zmprov mcf zimbraPop3CleartextLoginEnabled TRUE
That’s it.
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