I am connecting to the internet from schools, wireless public areas so too many ports are closed or blocked. in my vps i don't use imap service and i want to use port 143 for ssh tunneling. How can i do this?
Open the dovecot's configuration file (/etc/dovecot.conf) for editing and look for the following line inside it:
protocols = imap imaps pop3 pop3s
By default it should be at line 17. Delete 'imap' and save the changes. Finally, do not forget to restart your dovecot service for the changes you will make to take effect.
I hope this helps.
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