One of the recipients of a mailshot is complaining that Windows Live Mail (2012) (on Windows 10) produces certificate revocation information not available" warnings. I managed to find an old installer and sure enough, if images are not disabled, there are as many warnings as there are images with src="https://… in the message (where the site with the images is protected by a LetsEncrypt certificate), and each one needs a click to dismiss it. It’s a huge pain for them, mostly because of the blocking dialog and repetition. This doesn’t happen with IE11, so it isn’t the system certificate store or mechanism that’s the problem; presumably some aspect of certificate management is being done by Live Mail itself.
Of course, Live Mail is obsolete and no longer supported by MS. However, it doesn’t go down well with people to say “change the email program you’re using” especially when it’s only our own emails that are the problem as far as they are concerned. And it isn’t really that old a program, 2012.
Any ideas? Is there anything that can be updated that might help?
Here’s the repeated warning: