Hey,
It seems that your spf/dkim stuff is misconfigured so it gets sorted out as spam.
Here are the headers:
Received-SPF: permerror (aerospike.com: Redundant applicable 'v=spf1' sender policies found) receiver=mail1.xxx.com; identity=mailfrom; envelope-from="discuss@aerospike.com"; helo=tieinterceptor2.discourse.org; client-ip=64.71.148.3
DKIM-Filter: OpenDKIM Filter v2.9.2 xxx.com 22C1B3F4
Authentication-Results: xxx.com; dkim=permerror reason="key not found"
header.d=aerospike.com header.i=@aerospike.com header.b=QuopKmg8;
dkim-adsp=none (unprotected policy); dkim-atps=neutral
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=aerospike.com;
s=discourse; t=1447283301;
bh=sihLWTajTWHwNX42n/xP114GkUOSzIHlsWriTCERFvo=;
h=Date:From:Reply-To:To:In-Reply-To:References:Subject:
List-Unsubscribe:List-ID:List-Archive:From;
b=QuopKmg8HhonjnYbSGYICGyFVWJ6Y8IMVi+WeK0lUqfvG0GaLqH9n+R6w+I6pTSlW
WxioozpY5hOT52BS+vI1p3CKRT47YcBEFu6XaDeUnVFjI1vRXFALT4zdgCB0I21c6k
Ey3GeKCX6BfNkSIPXdhlV9ZB4aARI7oMVi2J1WCQ=
Date: Wed, 11 Nov 2015 23:08:21 +0000
From: Brian <discuss@aerospike.com>