The issue appears in the upstream repository as well, so I am forwarding this bug upstream:
$ git clone --config transfer.fsckobjects=true git://git.git.savannah.gnu.org/mailutils.git Cloning into 'mailutils'... remote: Enumerating objects: 90012, done. remote: Counting objects: 100% (90012/90012), done. remote: Compressing objects: 100% (15471/15471), done. error: object db3f12f432913395f01d3fbf21ddde61c3aa4ad8: missingEmail: invalid author/committer line - missing email fatal: fsck error in packed object fatal: fetch-pack: invalid index-pack output
