You are missing the point. Its only unnamed mail which is not being accepted.
Last xmas at KAF the welfare parcels totally overloaded the postal system. There were ISO upon ISO full of packages that were unabled to be delivered to the FOBs as it would of meant less food, water or ammo could be transported by our helos to do so.
in the end a MI-8 was chartered just to deliver these unnamed packages to all the FOBs. It was deemed an unacceptable risk to our crews hence the charter. Even the MI-8 wouldn't fly on some days leaving more of a back log.
I can assure you that all mail which is addressed personally to any member of HMF is delivered and with a high priority.
As much as it is a morale booster we just don't have the airlift to deal with this extra mail. The MOD is doing the right thing and prioritising what is essential that includes personal mail. Unfortunately the troops will go without their shoe box of goodies this year.