If you scheduled messages to be sent last night, some of them may not have been delivered until this morning. You may have also gotten erroneous Failed Send Message notifications for your scheduled messages (you can look in your Sent Mail folder to see if the messages were actually sent).
We’re sorry that this happened, and we apologize for any problems this caused.
What’s going on is that we’ve seen a lot of growth in the number of messages scheduled per user over the past few weeks, and as a result, we’ve outgrown our server capacity. Our maintenance scheduled for tonight is supposed to resolve that problem, but it’s happening a day too late.
We’ll do our best to make sure this doesn’t happen again. Thank you for understanding.