[plt-scheme] sirmail and html mail

Rohan Nicholls <rohan.nicholls at informaat.nl> wrote:
> [...] Is there a way to sort by thread?

Needing to sort by thread normally says to me that an email client is being
used where a newsreader would be better ;-) That said, I don't know if
SirMail has intentions to add newsgroup support, in which case it will need
threads.

> If not how would I go about creating a way?  I don't know how the threads
> are identified, so completely in the dark, any advice would be helpful.

The headers you need to construct the tree are References (best),
In-Reply-To (OK) and Subject/Date (worst case).  There is an RFC summarising
common email headers.  Find it on IETF.org or your favourite mirror.

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