Claws Mail warns that gmail certificate changed on every connection

Question

Since recently, my Claws Mail client pops up a message "SSL/TSL certificate changed" every time it tries to connect to my gmail account (at pop.gmail.com), with two options: "Cancel connection" and "Accept and Save". I use accept and save, but after 5 minutes the situation repeats. I know I can set skip_ssl_cert_check=1 in the configuration file clawsrc, but I don't fully understand security implications for that. What is particularly strange for me, googling on this pop-up message yields absolutely nothing, as if I am the first Claws and gmail user to encounter this problem. I use Claws version 3.16.0, ported in Windows 10, if that helps.

Answer 1

To get rid of this annoying repeated message, click on Configuration -> Preferences for Current Account, then click on SSL/TLS and SCROLL DOWN that panel to reveal some hidden checkboxes. Check the box labelled "Automatically accept valid SSL/TLS certificates" and clear the box labelled "Use non-blocking SSL/TLS." It took me forever to realize there were additional settings at the bottom of this panel.