On Wednesday 11 March 2015 at 17:37:34, Tom Ekberg wrote:
> 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.

Not that I know of.
Best would be to split out a new issue, because I first want to get
the behaviour as intended and sending a Precendence:bulk is intended
so far. Maybe you can describe the problems in greater detail.