Allow insecure connections to POP3 / IMAP iRedMail

In order to be able to connect to POP3 / IMAP without STARTTLS, you need to open the Dovecot configuration file:

sudo nano /etc/dovecot/dovecot.conf

Edit the two parameters listed below:

disable_plaintext_auth=no
ssl=yes

To return the parameters of the secure connection to POP3S / IMAPS back:

disable_plaintext_auth=yes
ssl=required

After the changes in the Dovecot configuration, you need to restart it:

sudo /etc/init.d/dovecot restart

See also:
How to enable SMTP without SSL on port 25 in iRedMail / Postfix

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