DracoBlue It would be good if we could set the maximum size of attachments that can be uploaded.
You can configure the maximum attachment size in Roundcube by editing the config.inc.php file located at /var/www/PATH/public_html/config. To set the limit, update the following line:
$config['max_message_size'] = 28400000;
Know that due to Base64 encoding and additional overhead, I had to set the limit to approximately 27 MB to allow for an exact 20 MB attachment size.
