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I replied to a message I received, and when I initially opened the reply window, there was an unexpected indent which I could not remove by pressing Backspace or by decreasing the indent. I ended up having to remove it by backspacing from the signature.
After I finished my response, I pressed send. The normal "sending" progress bar appeared, then this error appeared:
I pressed "OK", and it returned to the reply message. Every time I tried to send the message, the same thing occurred.
I noticed that the initial email (the one I had received) had the same indent. Every time I attempted to reply to the email, the same thing happened - the unexpected indent, and the error on send. I wrote a new email in response which worked fine.
What's going on?