Doesn't make a difference here as it's my responsibility to remember to pay my bills on time, I don't rely on anyone else for this. 90% of the time I've already been on my internet bank and made an online payment to Amex.

Bottom line is that postal strikes, light fingered postal workers or email servers being down shouldn't affect anyone's ability to make a timely payment. It's the same time each month, not too far from payday for me.