Congrats on your first hunt @geekgirl!

Pros:

• It's Opensource. It's a community involvement in terms of its development.
• It's secure and cares about its user's privacy and confidentiality

Cons: A lot of them

• It's very limited in terms of its database capacity per user.
• And because of that, people will have the option to become a premium user or a pro user offered with much more bigger storage for data
• Not the first end-end encryption type of an email service. Sounds like Protonmail...