Every time before I download to my computer, I first open SpamCop webmail to identify and report spam messages that SpamCop has not trapped.
Though I last downloaded late yesterday, this morning I found 20 new messages (out of 47) that were over a day old. Some were weeks old. One was nearly a year old!
I think that the delay is happening at SpamCop rather than my ISP that forwards to SpamCop, because some of the messages were SpamCop's own Quick Reporting Data messages. (And opening one of these, I could see that the reported messages were from the same time period.)
This isn't the first time this is happened, but it is the largest collection of delayed messages I have received so far.
What is happening? How can it be corrected?