The mail header

  Precedence: bulk

causes trouble with some of our 'user's. We have defined a small number of 
user objects for our trackers which have as their email address a mailing 
list. For example, we have a user 'A Lead' in one of our trackers that has 
the leads' mailing list as its email address (the 'address' column). This 
is used in the nosy and assignedto attributes. Emails for these users get 
directed to our mailman server which silently deletes them if they have 
this mail header.

Is there a way a configuration option could be used to decide where or not 
to generate this mail header? Something like 'mail.bulk_email = yes' in 
config.ini.