User complained that they didn’t receive a warning that their email hadn’t been delivered for 4 hours. They suggested that the warning go out sooner than four hours preferably 30 minutes.
I can understand where the person is coming from: They have an email and they want to get it to the destination as fast as possible with no problems. The issue in this case is the receiving SMTP server would accept the data it was just sit there and hang. Not much we can do about that…
I started to look into changing the defaults of 5d/4h. Five days for the queuereturn timeout and four hours for the queue warning.
sendmail pays attention to the Precedence: header but Notes only sets Importance and X-Priority. Importance is actually defined in a RFC but Precedence and X-Priority are non-standard headers.
I am pretty sure I don’t want to change the default q warning time but I am going to think about this one some more.