Debugger entered--Lisp error: (error "Sending...failed with exit value 1")
signal(error ("Sending...failed with exit value 1"))
error("Sending...failed with exit value %d" 1)
message-send-mail-with-sendmail()
gnus-agent-send-mail()
message-send-mail(nil)
message-send-via-mail(nil)
message-send(nil)
message-send-and-exit(nil)
* call-interactively(message-send-and-exit)