You need to find out why these emails were deleted, click on of these in the MWPro recycle bin, then click View>>Sidebar>>Evaluation button, and it should tell you there which spam tool is marking these emails.
For example, if Blacklist is selected, this email address, (or more likely the domain) is on the blacklist.
Edit or adjust the spam tool under Settings>>Spam Tools that is marking these emails as spam.
If you can't find an email, go to the Recycle Bin and see if you can locate it there. If you can't, then click on 'Show email logged' and it will display all emails that have come in to Mailwasher.