If you're not STUCK on using mailtrap - you can use "Papercut" instead. It is a local only email server and viewer, I was using Mailtrap - but kept hitting the free tier's limit

I installed paper cut 10 minutes after posting, works for my purposes. Happy with it

Used it for many years, very happy customer!

I've been using Papercut for a while now as well. It works great for my needs.