Constantly Surpressed
Anet put in the suppression so that your in-box is not flooded with gold spam but it does indeed pose problems for those legitimate uses of the mail system.
A proposal to fix it would be a spam report button so once so many people report a sender that sender then gets suppressed. Guild members are not going to be reporting their guild leader (unless they hate you :P) so they can mail as much as they need to but people would quickly report spam.
Theftwind (HoD)
Have a guild mailbox that only receives mail that originates within the guild. Boom bada bing, solved.
Both your suggestions are solid.
also a send mail to all guild feature would be nice, especially with guild missions coming could be very useful for reminders
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