What just happened with Mail?

[norse]

This has been happening to me for the past year. It happens randomly. Sometimes days/weeks or hours apart. When I notice a large number of emails being downloaded via activity viewer, I stop the download and use Inbox Get Info to view the list of emails on the server then delete the previously downloaded emails. A hassle!

I've been blaming my ISP for this. They've told me to delete the emails right away after downloading.

So, is this a Mail problem??