Boxer does not use the native spam folder
Unlike IMAP, Exchange does not have free free configurable special folders. Marking a mail as spam from Boxer moves the mail to the folder "Junk" and creates this folder if not existing. Unfortunately, this is not the native spam folder of Exchange, which is named "Junk-E-Mail" for my account.
If I report email as Spam, I want all futere emails from this sender trashed. Just throw them away. thank you.