Please accept my most sincere apology for my April Fool’s blog post yesterday. I have thought long and hard about what happened and I realise how very upset/angry you must have been.
I am really sorry for creating the situation which I know I should have handled better. I admit that I was in the wrong and can only say how sorry I am. I can promise you that this will never happen again (until next year) and hope that you will give me the opportunity to prove this to you.
I understand that it might be difficult for you to accept my apology but hope that this letter will help.