We've identified yet another client of ours who filter all Marketo emails as follows:
- When the email is sent, the words [BULK] are appended to the subject line
- Images are blocked
- When the user clicks the "click here" link to unblock all features (like images), the images remain broken/non-viewable.
Other than asking the client to whitelist our IP range (which hasn't worked with prior clients who have done this for us), is there anything we can do? We already have our SPF/DKIM setup properly, use branded tracking links, and send from our company's domain.