To create new SSL certificates for the dovecot pop3 and imap server on Ubuntu, follow these steps:

Make a backup copy of the old key and certificate file

sudo cp /etc/ssl/private/dovecot.key /etc/ssl/private/dovecot.key.old
sudo cp /etc/ssl/certs/dovecot.pem /etc/ssl/certs/dovecot.pem.old

Create the new key file

openssl genrsa -out /etc/ssl/private/dovecot.key 1024

Create the new certificate file, valid for 2 years

openssl req -new -x509 -key /etc/ssl/private/dovecot.key -out /etc/ssl/certs/dovecot.pem -days 730

Then restart dovecot

/etc/init.d/dovecot restart

How to renew the SSL certificate for dovecot on Ubuntu Linux

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