/usr/share/doc/libgnumail-java/api/package-list is in libgnumail-java-doc 1.1.2-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | gnu.mail.providers.imap
gnu.mail.providers.maildir
gnu.mail.providers.mbox
gnu.mail.providers.nntp
gnu.mail.providers.pop3
gnu.mail.providers.smtp
javax.mail
javax.mail.event
javax.mail.internet
javax.mail.search
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