Only Outbound email are quarantined.

 Only outbound email is being quarantined, mostly when spam is sent to an invalid address (the "undeliverable" message is quarantined) or when spam is sent to users with out-of-office turned on.  Here's an example of the former:

Delivery has failed to these recipients or groups:

user@baptisthomes.org<mailto:user@baptisthomes.org>
The email address you entered couldn't be found. Please check the recipient's email address and try to resend the message. If the problem continues, please contact your email admin.

Diagnostic information for administrators:

Generating server: MailServer.baptisthomes.org

User@baptisthomes.org
Remote Server returned '550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient not found by SMTP address lookup'

Original message headers:

Received: from mailserver.baptisthomes.org (192.168.120.70) by
 BHS-EX16-01.baptisthomes.org (192.168.120.70) with Microsoft SMTP Server
 (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id
 15.1.544.27; Mon, 9 Jan 2017 07:07:54 -0500
Received: from bhutm9.baptisthomes.org (192.168.1.2) by
 mailserver.baptisthomes.org (192.168.120.70) with Microsoft SMTP Server
 (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id
 15.1.544.27 via Frontend Transport; Mon, 9 Jan 2017 07:07:54 -0500
Received: from mta9.wanwul.us ([104.129.48.234]:48180 helo=wanwul.us)
        by bhutm9.baptisthomes.org with esmtp (Exim 4.82_1-5b7a7c0-XX)
        (envelope-from <wrinkly@wanwul.us>)
        id 1cQYjG-000416-0D
        for user@baptisthomes.org; Mon, 09 Jan 2017 07:07:45 -0500
Subject: Get a new Alarm Special + $100 Visa Gift Card Bonus from Protect Your Home
From: ADTAuthorizedDealer <riddled@mughal.wanwul.us>
To: <user@baptisthomes.org>
Date: Mon, 9 Jan 2017 04:06:38 -0800
Content-Type: multipart/related;
        boundary="0bb548aeb2531700ea09429c9d130813a"
MIME-Version: 1.0
Message-ID: <0.0.0.1A.1D26A70E1BC1278.1CD482@wanwul.us>
Return-Path: wrinkly@wanwul.us

Here's my current configuration:

• I registered for the Barracuda RBL, and I have zen.spamhaus and bl.spamcop configured, as well as the two default RBL’s that Sophos uses.
• I have confirmed spam set to be rejected at SMTP time, and all actions in the spam filter are to quarantine.
• Everything is checked under advanced spam filtering, including strict RDNS Checks.

Thank you.