I just got off the phone with BA MRU and as suspected, they have had big trouble with their email server. However, they accepted credit card info over the phone and are now updating the taxes and will issue the ticket when it's complete, hopefully later today. They were very friendly and restored my sense that the MRU staff is easy to work with.

When I said my name to the phone answerer, she immediately said, "Oh yes I'll put you through to (the supervisor) straight away." Like they knew who I was. Yikes.