OK, thanks for your vote.
I would also like to officially ask for this. SFTP servers backed by HDFS via NFS Gateway do not support hard links and thus cannot service the rename command. The firstname.lastname@example.org extension provides an alternative renaming method that does not result in an NFS LINK command, but instead, an NFS RENAME command.
Thanks for your suggestion.
Will see if more people ask for this.
It would be useful to have an option to make use of the email@example.com extension when available.
This provides an alternative to the link/remove rename operation which is not supported on all file systems. In addition, it prevents the scenario where a link is successful and delete fails, leaving two files on the system.