[Remail] Triggering welcome emails on list.yaml changes

[Konstantin Ryabitsev]

Hello:

What is the proper way to trigger sending out welcome emails on changes 
to the repository containing list.yaml? Currently, those welcome emails 
don't get sent out until someone sends an actual email to the list, 
which is not what list admins are expecting.

In our setup, we don't have a daemon running -- deliveries are happening 
via a procmail trigger.

Best,
-K