The anti-spam policy in the client affects email receiving locally. You can change the anti-spam options to reduce false positives (legitimate emails getting blocked).

I.Foxmail anti-spam settings:

Open Foxmail and click the drop-down button in the upper-right corner, click “Settings” -> “Antispam” -> “Mails Filter” in the pop-up menu, and disable “Use Bayes spam filter to filter incoming messages” and change Bayes Strength to “Low”.

II.Outlook anti-spam settings:

Open Outlook, click “Home” -> “Junk” -> “Junk E-mail Options” in the menu, and select “No Automatic Filtering”.