I semi-regularly receive emails with attachments from a certain sender. I very much want these emails, I have paid money for the attachments.

Most of the time but not always, GMail puts these emails directly into trash, bypassing the Inbox. That's Trash, not Spam.

Last week I received two of these emails within minutes of each other. One went to the Inbox, the other into Trash.

The sender is in my contact list.

The instructions to Whitelist an email address seem only to be designed to prevent the message going to Spam. These messages are going to Trash. I do have about a dozen Spam filters that send certain incoming emails directly to Trash, but none of those filters should have any effect on these emails that I want to keep. I am filtering --> Trash the following words: sexually, penis, sex, pills, viagra, vigara, medications, blonde, drugs, pharmacy, casino, promotion, T-Mobile, Samsung, and raffle.

Is it possible that the Spam filter is searching for those words inside the attachments? If so, that would explain a lot... (The attachments are zipped eBooks.)

What should I do to ensure that these emails get to my Inbox?

tanstaafl.