Both you and jgarzik experienced mail getting tossed into gmail's spam folder thanks to DKIM... I am concerned that DKIM is too fragile and not very compatible with mailing lists.
We already removed the footer because it was incompatible with DKIM signing. Keeping the "[Bitcoin-dev] " prepend tag in subject is compatible with DKIM header signing only if the poster manually prepends it in their subject header.
I am already concerned that the lack of the Mailman footer will make it hard to identify where exactly subscribers need to go to unsubscribe or look at archives. Removing the subject tag might make DKIM enforcement work a lot better, but I can easily see our obtuse subscribers as being extra confused by this.
Opinions?
Warren