I'm wondering how other Courier users feel about an idea of mine:

I would find it helpful if more information would appear in mail delivery status headers. For example, if a message is cancelled, instead of just seeing this:

Subject: NOTICE: mail delivery status.

(with the body containing "<<< Message canceled")

... I could see something like this:

Subject: NOTICE: mail delivery status: Message canceled

(and the body could still contain "<<< Message canceled")

With this added information in the subject line, I would be able to write filter rules that do different things depending on the delivery status, without having to test anything within the body of the message. This would be desirable for me, because in addition to maildrop, I make use of other mail filtering software that is more efficient if it only looks at headers and not message bodies.

An alternative would be to have a special header in a delivery status message that contains this delivery status information. For example:

X-Delivery-Status: Message canceled

Is there any support for this idea?

Thanks.