Please give us a "clear Blacklist" and a "delete all messages in inbox" function.

[Curia_Regis]

The above suggestions are great because they only require one tiny change to the interface - a single button. However, they're kinda the nuclear option. What if you want to keep a couple people on your blist, or keep a few messages in your inbox?

In my opinion, the best solution, though this would require more UI work and design time, would be to have a series of small checkboxes next to each name/message. You would have a "select all/deselect all" button and a "delete selected" button. That way, you can click "select all," then uncheck the couple ones you don't want to delete, and then click "delete selected."

This is how such lists in other products tend to work, such as gmail and google docs.

My thinking was a solution like that would take more time, they would be less likely to give it to us over something easier to implement yet largely effective.

[SCUBA_Instr]

If, it's Square Enix intent, to allow the RMT threat to fester
[aka "heads in the sand"] then an easy-to-code mediocre quick-fix is,
(to allow entertainment without RMT harassment):

-- Allow join party while the busy flag is displayed.
-- Allow ready-check during busy flag.
-- Allow /Tell conversations with friends and FC during busy flag.
-- Neutral or positive busy flag icon, vs. the angry fish head symbol.
-- Allow boot-up into a busy flag condition.

This is not a very good fix, in light of far better suggestions right
here on this website. This fix separates subscribers who prefer not to be
harassed from those who sympathize with criminal spammers
(spammer sympathizers).

This will define 3 groups of players.
-- Decent players who desire abuse-free entertainment
-- Spammer and bot sympathizers.
-- Criminals (bot owners)

This idea implies that Square Enix Terms of Service agreement is a farce.