How to move Spotify spam into the spam folder?

I get a lot of emails pretending they are from Spotify. Since I don’t have Spotify, I want to move them into a spam folder. Spotify occurs in a column called “correspondents”. I have set up a rule in Thunderbird:

Rule name: Spam: Spotify
Match: all of the following
   Rule: From contains Spotify
Action: Move message to [folder] on [email]

This is the only rule, so it doesn’t matter whether I choose “match all” or “match any”.

There’s an email (many, in fact) shown as Spotify <admin89405@uma.edu.sv> in my inbox. The filter does not find that email, although it clearly has “Spotify” in it.

What do I need to change in order to get rid of the emails in Thunderbird using a rule?

I have tried:

• using =?UTF-8?B?U9GA0L500ZZm0YM=?=, the Base64 encoded version of “Spotify”, which is actually used in the email source

Here’s what it looks like: