Are you trying to separate your MMS email from all the rest? Do what the pros do and create an automatically organizing folder (Google calls folders “labels”). First, create a folder and then create a filter that places all messages matching the “List-ID” header into your new folder by following the instructions for your email service below (you might need to use a desktop computer to set them up.)
Here are the List-ID headers for the MMS mailing lists:
Are you tired of a conversation thread or need a break from someone's flurry of messages? Almost every email reader has a filter that you can use to automatically hide, place in a special folder or “mark read” messages that match a certain subject or sender. If you don't want to see a particular discussion, create a filter to mark read/delete all messages that match the subject of the discussion. If you need a break from a particular individual, create a filter that matches the “X-Original-Sender:” header for the sender's email address. You can also use the “From” header, but sometimes Google Groups mangles this header.
Here are filtering instructions for a few common email services:
Gmail https://support.google.com/mail/answer/6579?hl=en
Yahoo https://help.yahoo.com/kb/learn-create-edit-filters-yahoo-mail-sln15994.html
Hotmail/Outlook.com https://www.geeksforgeeks.org/how-to-filter-emails-in-hotmail-set-up-rules-to-organize-inbox/
Apple
Others https://www.google.com/search?q=filter+email+%3CReplaceThisWithMailClientName%3E