End of day blooper

I received an email from an important government office.  I had been in meetings all afternoon so wanted to quickly reply to the person to let them know I had received their email and would respond to them as soon as possible.  I wrote my message and pressed Send.  As the Send was being processed and it was leaving my screen, I noticed with horror that instead of Hello I had written Hell.

My email went like this:

Hell Mr. Smith,
I have been in meetings all afternoon and will respond to your email first thing tomorrow morning.
Patricia

Ugh!

I quickly emailed him back to apologize and explain what had happened.  He emailed me back to say he hadn't even noticed, but he was laughing hysterically and said I had certainly made his day.