[Mailman-Developers] New RFC on using DKIM with MLMs

Ian Eiloart iane at sussex.ac.uk
Tue Nov 1 13:25:14 CET 2011

On 29 Oct 2011, at 05:39, Patrick Ben Koetter wrote:

>> Hmm, adopting a hash-tags format here would be kind of interesting for interop
>> with social networking sites.  It wouldn't have to be reflected in the name of
> ACK with the notion that hashtag seems to closely realted with twitter and a
> more general 'tag' would stay away from that.
> Is there or should there be a distinction between 'tag' and http 'keywords'
> <http://en.wikipedia.org/wiki/Meta_element#The_keywords_attribute>? Should we
> use 'keywords' instead?

Well, both are just ways of sorting messages into sets, rather than categories. By definition (using the usual mathematical definition), categories don't overlap but sets may, so objects may be in only one category, but may be in several sets. So, yes, keywords, tags and hashtags are pretty much the same thing. 

And, it turns out that the Keywords: header is already defined in RFC5322:

3.6.5.  Informational Fields

keywords        =   "Keywords:" phrase *("," phrase) CRLF

The "Keywords:" field contains a comma-
   separated list of important words and phrases that might be useful
   for the recipient.

There's also a "Comments:" field defined, apparently.

Ian Eiloart
Postmaster, University of Sussex
+44 (0) 1273 87-3148

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