Add note that the plugin needs to be disabled and re-enabled to apply settings

[licaon-kter]

Seeing failure connecting to IMAP server: invalid greeting received from server: not a status response
I've setup: mail.domain.tld:993
Security: SSL or TLS (as elsewhere in mattermost)
Password (#13)
Interval: 60

What does the error mean? What's the issue?

[licaon-kter]

Ok it appears that with TLS it works, after I disable and re-enable the plugin, changing between thdm and saving did not help.