Updated: March 31, 2020

When you install Outlook 2010 / 2013 or newer, it automatically disables images in emails that you are receiving. Images are disabled for security reasons, as they are widely used by spammers to validate email addresses by loading a special image inside the email content: if that image file gets downloaded from the spammer’s server, then obviously the related email address (your address) is valid & in-use by someone.
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