Trouble making an ITP - continued

[Marcin Mielniczuk <marmistrzmar@gmail.com>]

I made the mistake of replying directly to the digest, so I'm posting this once again.

I set up the smtp server in ~/.reportbugrc to

reportbug.debian.org

The server was recognized but the following error appeared:

SMTP send failure: (550, 'No valid sender found in the From:, Sender: and
Reply-to: headers'). Do you want to retry (or else save the report and exit)?
[Y|n|q|?]? ?

I'm attaching the message. What have I done wrong?
Thanks

-- 
Marcin

Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: Marcin Mielniczuk <marmistrz@inboxalias.com>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: ITP: down -- A simple game written in Ruby/SDL
Message-ID: <20150724155830.10008.58394.reportbug@marcin>
X-Mailer: reportbug 6.5.0
Date: Fri, 24 Jul 2015 17:58:30 +0200
X-Debbugs-Cc: debian-devel@lists.debian.org

Package: wnpp
Severity: wishlist
Owner: Marcin Mielniczuk <marmistrz@inboxalias.com>

* Package name    : down
  Version         : 1.0.0
  Upstream Author : Yutaka Hara <yutaka.hara+deb@gmail.com>
* URL             : http://route477.net
* License         : MIT
  Programming Lang: Ruby/SDL
  Description     : A simple game written in Ruby/SDL

Did you ever play Icy Tower? Did you ever have the opportunity to play it downwards? Now you have!

It's simply a nice game :)
It's my first package to be maintained, I guess I'll simply contact the original author whenever some bugs arise and push updated versions. I don't expect many issues, though :)
I need a supporter - I don't have the rights to put the deb into the repos.