Windows 7: IE11 no longer supported, along with third party email clients that use it
If you still use Windows 7, you have to stop using Internet Explorer (Edge is supported). Many email clients also use IE (mshtml.dll) to display HTML.
Outlook 2016 is probably OK as long as it's supported. Thunderbird uses Gecko (Mozilla). eM Client uses Chromium. Anything else probably uses mshtml, especially if it's less then 40MB. Corrections welcome.
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