[Dovecot] Not using "." as separator?

When using maildir storage, is there any way to use something besides "." as the folder separator?

I like to use folder names that match people's e-mail addresses (that's a default behavior in mutt), and "." is a pretty popular character in e-mail addresses. Ideally, I'd like to use "/".

Is "." allowed in mailbox names when using mbox storage?

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