Install Dovecot

<?php
$URL="https://raw.githubusercontent.com/panticz/installit/master/install.dovecot.sh";
echo "wget $URL -O - | bash -";
echo "

";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $URL);
$result = curl_exec($ch);
curl_close($ch);
htmlspecialchars($result);

echo "

";
?>

/etc/dovecot/conf.d/10-master.conf
inet_listener imaps {
port = 993
ssl = yes
}

openssl req -new -x509 -nodes -out /etc/dovecot/dovecot.pem -keyout /etc/dovecot/private/dovecot.pem -days 1095 -newkey rsa:4096

Links
http://wiki2.dovecot.org/SSL/DovecotConfiguration
http://wiki2.dovecot.org/SSL/CertificateCreation
http://ebalaskas.gr/wiki/dovecot/DovecotSSL
http://wiki.ubuntuusers.de/Dovecot
https://help.ubuntu.com/11.04/serverguide/C/dovecot-server.html
http://wiki.dovecot.org/MainConfig
http://www.howtoforge.com/dovecot_mail_server_sieve_virtual_users