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Most email spam is sent in HTML{{Citation needed|date=December 2013}} for these reasons, so spam filters sometimes give higher spam scores to HTML messages.{{Citation needed|date=December 2013}}
In 2018 a vulnerability ([[EFAIL]]) of the HTML processing of many common email clients was disclosed, in which decrypted text of [[Pretty Good Privacy|PGP]] or [[S/MIME]] encrypted email parts can be caused to be sent as an attribute to an external image address, if the external image is requested. This vulnerability was present in Thunderbird, macOS Mail, Outlook, and later, Gmail and Apple Mail.<ref name="ars">{{cite web|url=https://arstechnica.com/information-technology/2018/05/decade-old-efail-attack-can-decrypt-previously-obtained-encrypted-e-mails/|title=Decade-old Efail flaws can leak plaintext of PGP- and S/MIME-encrypted emails|website=arstechnica.com|date=14 May 2018 }}</ref>
== See also ==
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