Sender Authentication Failed on valid emails

We have a couple users who are having valid emails blocked.  Our Messaging Gateway (version 10.5.2) is configured to authenticate both SPF and Sender ID.

The emails are requested weekly rate updates, and the Accepted from and Logical IP when I view the message audit details are valid within listed addresses when I SPF lookups.  domain/IP does not show up on the common blacklists.

Failed Verdicts are "Sender Authentication Failed", with Filter Policy of "Static senderauth fail".

Attaching a screenshot of the log for one of these messages.

Any thoughts or ideas?