firstname.lastname@example.org used to be used as a Maintainer/Uploader for packages maintained by the old Debian Multimedia team. Nowadays email@example.com should be used for this instead as described at DebianMultimedia/DevelopPackaging.
A list of packages using the old Maintainer/Uploader can be found at http://firstname.lastname@example.org
The transition status at the time of writing is as follows:
- milkytracker: fixed in git
- ocp: fixed in git
- stops: fixed in git
- all packages are now OK in git, they just need to get uploaded over time