[Mailman-Developers] Per-user subject prefix setting

[Kenneth Porter]

A frequent request on mailing lists without a subject prefix is to add one. 
This often leads to long debate threads about the utility of the prefix. 
There seems to be two different styles of processing mail that leads to 
this conflict. One style (which I use) is to filter mail into many folders, 
one per list. No tag is needed in this case. The other style is to dump all 
mail into one or a small number of folders, and in this style one needs to 
tag to know which list a message belongs to.

This has been captured in this feature request:

<https://sourceforge.net/tracker/?func=detail&atid=350103&aid=1104433&group_id=103>

There seems to be limited code for customizing messages per-user, but this 
setting may want to be treated as some kind of user "class" setting so that 
messages can still be batched for the no-prefix class and the add-prefix 
class. Perhaps this could be implemented as two distinct queues, similar to 
the way digests are treated as a distinct queue.