Some email not arriving in Roundcube (but passes MagicSpam)

Hi!

So I've got this very weird thing that some email is visible in the MagicSpam log and marked as OK (HAM), but somehow doesn't arrive in RoundCube.

I've tried the following:

1. Deactivating MagicSpam.
2. Deactivating SpamAssassin-spamfilter in Plesk.
3. Checked the Roundcube spam folder of this particular mailbox.

It's very strange since it only applies to some emails, this email was from google.com which in general should work and arrive.

Is there a way to find these...

Some email not arriving in Roundcube (but passes MagicSpam)