On 11.09.2018 12:40, Jorge Bastos wrote:

I have HTTPS in the vhost that the webmail is running, everything's
fine, but, if I click an email that has images that are loaded from an
HTTP:// url (without HTTPS) the browser starts telling me that the HTTPS
validation failed with the yellow sign in the padlock.

https://github.com/roundcube/roundcubemail/issues/5996