It is not always the Spanish post office´s fault!

Sir,
I was recently awaiting an important letter (with documents) from the UK, and it arrived here last Friday, three weeks after being posted from England. We were ready (as always) to blame the Spanish postal system, when 'lo and behold, in the bottom right-hand side of the envelope was stamped the printed communication “Missent to Malaysia”! The letter was correctly addressed and no Spanish postal department could mistake Mallorca for Malaysia, so only the British post office can be at fault. It makes one wonder, ie, that they have a special stamp for Malaysia, do many letters go walkabout there? Or, do they have lots of stamps for different countries to console those awaiting mail, that at least they know where they went! Funny old world, isn't it?
Yours sincerely,