Here is a patch on tla/libarch/namespace.c that makes it pass the previously uploaded test by allowing '_' in the name part of the email adress in the archive name.

I am not sure about '_' validity in the domain name part of the email so I didn't change that.

(and sorry about the empty comment, not used to this interface)

I try to follow the tutorial.

"An archive name consists of an email address, followed by two dashes (-- ), followed by a suffix."

But make-archive doesn't accept email addresses containing an underscore (invalid archive name). If I change that to a dash (thus invalidating the address) it works.