Whilst researching and finding options for university, I sort of ended up subscribing to almost 180+ mailing lists. It's really important to understand here that I can be extremely lazy sometimes, and having to go through each email to unsubscribe wasn't how I wanted to spend my evening.
So instead, I went looking online for solutions and I found Unroll.me– an amazing website/company that allows you to easily unsubscribe to emails in just one click.
It also allows you to organise your subscriptions and make your inbox so much cleaner. If you download the app (iOS/Android), then you can literally unsubscribe or keep subscriptions by swiping. Honestly speaking, I think that makes the process much more fun and efficient.
Let me know in the comments below whether the app/website worked out for you or not! I hope this was helpful :)