I found the answers in one of your responses to others. Thank you @Justin_Barrett . This solution is brilliant 

@Justin_Barrett Genius, thank you! I've pretty much duplicated this solution but for some reason, I dont get the same result in truncated field. Would really appreciate any help!  

Until then, you can create a rule in your Outlook/Gmail to filter/delete emails where not mentioned

@Vivid-Squid , thank you! I've had the same question. Would you be able to show how to write it for the attachment field?Thanks!