I'm definitely not a fan of any of these mail changes.
The most egregious of these changes is the Rewards of the Worthy expiring in just 7 days. This is a ridiculous limit and one that will have extreme impact during each Whitestrakes Mayhem event. Anyone who hits that event hard earns hundreds of these mails, and now the 7-day limit means that you have to stop participation of the event to clean out your mailbox because the rewards won't even last until the end of the 12 day event. If the toon you want to sort through the mail and decon with isn't the one that you are grinding AP on, then you are stuck unable to que for the campaign because you have to be on a different character to clean your mailbox. Often when the campaign queues are 100+ this could mean hours of lost event participation time each night because of this mailbox limit change.
Please reconsider increasing all the mailbox time limits, but especially the RotW limits to at least be longer than the 12-day PVP event.