Newsletter

When I click on a Pentax User Newsletter in my inbox I get a security warning saying that the security certificate is not valid for the site and do I want to proceed, yes , no or view certificate. Which ever I click the warning will not go away and I cannot read the letter, delete the letter, move it to spam box or move on to any other email. The only way I can get out of it is to use task manager to close the programme.
Are these genuine Pentax User Newsletters? Has anyone else got this problem and knows how to get rid of these letters.

Maybe your ISP has it marked as spam, in which case there must be a "not spam" button somewhere. Or make it a specifically allowed web address in your Internet options.

My newsletters arrive just fine, so it may be something that is blocking yours.