Bitten by a bug
I love computers but hate them in equal measure sometimes. The sense of pure frustration and hatred is so maddening when you come across something that stops you doing what you wanted the machine to do for you, aka a computer bug.
In this instance I’ve been merrily sending emails from my photography account to clients and others and have now only found out that a lot of them haven’t been sending or even filing in the sent items. They just disappear into the ether. Fortunately I’m not the only one as this thread on discussions.apple.com bears witness to, beware it’s filled with despair, hatred and frustration. There appears to be no reliable fix as such with a few edge cases saying delete all mail accounts and so on.
Ahh well a fun evening of deleting and re-adding mail accounts waits. The most maddening thing is that my iPad works just fine.