Due to the fact that many e-mails we send with our company address do not get delivered, rejected or marked as spam, I searched for a solution on the web.
One of the solutions I found was to use DKIM on my mail server, so I set it up using this guide (http://linuxaria.com/howto/using-opendkim-to-sign-postfix-mails-on-debian).
I tested my configuration by sending an e-mail to my gmail address, but I think something went wrong:
Authentication-Results: mx.google.com; spf=pass (google.com: domain of email@example.com designates [IP-ADDRESS] as permitted sender) firstname.lastname@example.org; dkim=neutral (bad format) email@example.com Received: by mail.mycompany.com (Postfix, from userid 0) id 0AD9D2841B4C; Tue, 3 Dec 2013 10:30:51 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mycompany.com; s=mail; t=1386063052; bh=A3KLcdiP7ZMwPprgmvkJy01tx3mp6kKlCIuik8lKKnE=; h=Subject:From:Content-type:To:Message-Id:Date; b=cUbSyWpGBoa26Jkg9zer9XhxFmrhiQ49MOmP9nE2W5GNQlZYwyBt+jGbzaHIO1yFT A8lugRxXzH1EsS/ymkBqsx0HBCzSpn8PK0ya2gb90jydEleMa4had7Z3PuonbZ4Yw8 fwcm4Zz+aZv2qYlLIT0ovhL+YI8pN14YJ7W6mpFA=
From what I can make out of it, something is wrong with the DKIM-signature itself, but I have no idea.
On a side note, is there any other way to prevent our mails getting blocked by spam filters?
Big thanks! Rik