It would be really helpful if email blasts could be sent to more than one list or filter at the same time rather than having to send the message multiple times.
Currently it is possible to filter for people on more than one list and also to add everyone from a filter to a list.
So if I wanted to email list a, list b and filter c.
I would first add everyone on filter c to a list (let's name it 'c') -
Then filter for people on list a, list b, and the new list c and save that filter -
Then I can send an email to that new filter and the email will go to everyone on all three lists, and if I add anyone to any of the lists they will always be added to the filter.