One star until the random "unknown error" when sending attachments is known and permanently fixed. No accountability for your service, or you'd at least let me know up front when I needed to re-send... ETA: The colossal attachment was 1,194 kB total, but you're responsible for reliably sending whatever the maximum attachment size it is the app supports. I wish I could help more with a diagnosis, but if the error is "unknown" to the coders themselves, who is accountable for knowing the code?