Message delayed too long

[mm3509]

I have been using send-delay and it works most of the time. Sometimes, the emails is only sent much later. For example, yesterday I drafted an email at 7pm scheduled for 5 minutes later. I may have closed the computer and changed locations in the 5-10 minutes after (I am not sure). Then I reopened, reconnected, left running for 2 hours, and restarted, and the email was only sent this morning when I launched Emacs again.

I often get a message in the mini-buffer saying "Stopping call to process with quit inhibited", or something like that. Could that be the reason?