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Internet Message Format (IMF) is specified by RFC 5322. It defines a variety of header fields, such as To, From, and Subject.

It also defines the Comments header field and the Keywords header field.

https://www.rfc-editor.org/rfc/rfc5322#section-3.6.5

Does anything actually use these two header fields today, or are they totally superfulous? In other words, are mail clients in modern use expected to make use of these?

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james.garriss
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  • I'm not sure what [actual problem](http://superuser.com/faq#dontask) you are facing? – RedGrittyBrick Nov 14 '12 at 21:33
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    Pretty simple: Comments and Keywords are header available to email clients and servers. As far as I can tell, none of my clients use them. I am wondering if any clients or servers actually use them. – james.garriss Nov 15 '12 at 14:19
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    I'm not sure why this is considered "not constructive". I'm very curious to know the answer, and answers would certainly be supported by facts and references. – npdoty Nov 21 '13 at 22:03
  • Closers can be trigger happy. It happens. – james.garriss Nov 21 '13 at 23:27
  • Made edit to more literally meet SO requirements. – William Entriken Dec 28 '16 at 16:00
  • I don't know any client that does support them. But I think it would be usefull to enable search by keywords. Instead of indexing the whole text of the message. A good practice well explained in "Everything Is Miscellaneous:" by David Weinberger. – user1708042 Mar 26 '18 at 12:03

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