Carlos Lopez writes:

Hi Sam, thanks for the explanation, but.

When this message appears:

id=0020600B.4A9FDAE3.000019C5,from=<>,addr=<[email protected]>:
250 Backscatter bounce dropped.
Sep  3 09:04:03 localhost courieresmtp:
id=0020600B.4A9FDAE3.000019C5,from=<>,addr=<[email protected]>,success:
delivered: backscatter bounce dropped

Does that error come from courier modules or from the @yahoo.com server?

From Courier. See my last message.

If it is from courier, how to do in order to inform [email protected] (or any 
domain) that his mail had failed?

The bounce is what informs the sender of a delivery failure. See my last message for more information.

Now,

Well, messages should not be queueing up. As you've seen
yourself, when Courier holds a message to a recipient in the
queue, because of a temporary delivery failure, it stops
accepting any more mail to the same recipient.

So, you should not have more than one or two messages in
the queue to the same recipient.

As I already stated [email protected]'s maildirsize is:

52428800S 52429312 45

This has nothing to do with the mail queue.

from many days ago, but sometimes courier accepts email to t...@mydomain user and it queues again.
Does courier have a counter or something similar, that counts the times that 
and error of a failed delivey and reset it after a period of time?

See the explanation at the beginning of the courier(8) man page.

Why courier accept and queues it, if [email protected] is already
overquota, Wouldn't be better to just block delivey from

Because it is not know where mail addressed to "[email protected]" goes, until an actual delivery attempt gets made. The recipient's .courier file may, for example, specify that the recipient's mail is to be forwarded elsewhere, or be delivered to some non-default mailbox location. Therefore, when mail gets accepted for a given recipient, the mail's ultimate destination is not know.

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