HTML email: Difference between revisions

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Multi-part formats: «+"The message itself is of type multipart/alternative, and contains two parts, one with type text/plain, and one with text/html. HTML email clients read the HTML part, while text-only clients ignore the HTML part and displa
Security vulnerabilities: «"Some" → "The multipart type is intended to show the same content in different ways, but this is sometimes abused; some", -"multi-part message", "," → ". They do this"»
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If an email contains inline content from an external server, such as an [[Digital image|image]], the server can alert a third party that the e-mail has been opened. This is a potential privacy risk, revealing that an email address is real (so that it can be targeted in the future) and revealing when the message was read. For this reason, some e-mail clients do not load external images until requested to by the user.
 
SomeThe multipart type is intended to show the same content in different ways, but this is sometimes abused; some [[e-mail spam]] takes advantage of the multi-part message format to trick [[spam filter]]s into believing that the message is legitimate,. They do this by including innocuous content in the text part of the message and putting the spam in the HTML part (which is what displays to the user).
 
Most e-mail spam is sent in HTML for these reasons, so spam filters (such as [[Spamassassin]]) give higher spam scores to HTML messages.