Filtering out email by sender can be complicated, what at first looks like a simple process of adding the senders From address in the filter can actually be far more complicated, in an email hosted solution.

Here is a real world example:

Received: from pmta1.delivery7.ore.mailhop.org (54.186.27.61) by
CLU-EXCH.customer.local (10.0.25.213) with Microsoft SMTP Server id 14.3.174.1;
Mon, 18 May 2015 15:18:30 -0600
Received: from customer.com (unknown [104.219.12.197]) by
inbound5.ore.mailhop.org (Halon Mail Gateway) with ESMTPS for
[email protected]; Mon, 18 May 2015 21:15:43 +0000 (UTC)
Received: from customer by server1.sleekhost.ca with local (Exim 4.85)
(envelope-from [email protected]) id 1YuSNx-0001qw-Qf for
[email protected]; Mon, 18 May 2015 17:15:41 -0400
To: [email protected]
Subject: *SPAM* Request to plan your stay
X-PHP-Script: www.customer.com/index.php for 70.59.7.26, 70.59.7.26
Date: Mon, 18 May 2015 21:15:41 +0000
From: C Lazy U Website - [email protected]
Message-ID: [email protected]
er-Via: server1.sleekhost.ca: authenticated_id: customer/only user confirmed/virtual account not confirmed

(/[email protected])[email protected]

The important part to look at here is even though the From: C Lazy U Website - [email protected] indicates one thing, the headers say something completely different. 

(envelope-from [email protected]) id 1YuSNx-0001qw-Qf for [email protected]; 

The correct address to filter is the envelope-from ID if filtering the From address does not work.  

If you have problems getting your filters to work, contact customer care and our enterprise email service team will help you refine your filtering rules.