Juste made the switch to Proton Business and was also surprised by this limit. Managed to organize myself temporarily, but would also appreciate an increase to 5 levels please ! @Proton Admin

Another improvement I would like to suggest is increasing the supported hierarchy depth for email subfolders.

For users who organize their mailbox with many folders and nested categories, the current subfolder structure can feel too limited. Allowing more levels of subfolders would make it much easier to keep emails well organized, especially for complex personal or professional workflows.

This would be particularly useful for users migrating from other email clients or providers where deeper folder hierarchies are already supported.

This is critical to me (and most organizations considering ProtonMail for business) Please consider adding this to the roadmap ASAP

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I need to be able to sort mails in different subfolders if I move to proton mails. 3 levels is not enough.

I'd love more sub folders, too. 3 is not enough sometimes to separate topics in my mail account

That is the reason not fully migrate to proton.
Will brake my organization of mail from other platforms to import here.
I will like to have my mail organization not what I suppouse to use.