This is related to Bug #798413 and it's also quite "kafkian".

I did a source-only upload and it was REJECTED with a message like this:
------------------------------------------------------------------------
Source-only uploads to NEW are not allowed.

===

Please feel free to respond to this email if you don't understand why
your files were rejected, or if you upload new files which address our
concerns.
------------------------------------------------------------------------

When the upload is not source-only and it's not immediately accepted
for the same reason (i.e. requiring NEW processing), the message is
like this:

------------------------------------------------------------------------
binary:ekg2-api-docs is NEW.

Your package has been put into the NEW queue, which requires manual action
from the ftpteam to process. The upload was otherwise valid (it had a good
OpenPGP signature and file hashes are valid), so please be patient.
[...]
------------------------------------------------------------------------

Omitting long explanations about how the NEW queue works is ok, but at
the very minimum, the uploader should be told about *what* part of the
upload is considered to be NEW.

Thanks.

Hi,

2015-09-09 11:25 GMT+02:00 Santiago Vila <sanvila@unex.es>:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The line above indicates which part is considered NEW.
It mentions both binary packages and source packages.

The line above does not appear at all when a source-only upload is made.