When manually saving files from some entity, you often change their names to
fit some naming scheme you're using (e.g. YYYY-MM NiceTelCo Phone bill.pdf).
When automating this action using FiltaQuilla the saving happens automatically,
but it's the original name that's used, which often kind of garbled and
meaningless.

The attachment saving should have the possibility of filename generation, using
fields/data from multiple sources: The attachment's name, the message headers,
the folder, the account, the time and date etc. This could be designed to be
similar to the (re)naming mechanisms we have in media file meta-data editors
like EasyTag; see: 

https://help.gnome.org/users/easytag/stable/file-rename.html.en
and the "Scannar Window" section here:
https://projects-old.gnome.org/easytag/screenshots.html

again I don't thnnk quickFilters is the correct place for this feature -
quickFilters is about managing / creating new filters but from that point
onwards it is fairly static - you want the filtering process itself to be more
flexible. Which is clearly a request for extending filter actions, which
FiltaQuilla offers:

https://github.com/RealRaven2000/FiltaQuilla/issues