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We have had a few instances now of email addresses for new users being set to simply @. This results in email sending failures which are not noticed until the logs are checked as the ticket itself does not have any indication of a failure (client creates another ticket asking why they have not received an answer so we check the logs).

Here are the headers from an email we recently received that showed this behavior:

Received-SPF: none (knowbase.co.za: goodline.info does not designate permitted sender hosts)
Received: from 95-181-45-234.goodline.info ([95.181.45.234]) by knowbase.co.za with
MailEnable ESMTP; Fri, 31 Jan 2020 15:51:01 +0200
Received: from unknown (36.40.183.137)
by smtp18.yenddx.com with QMQP; Fri, 31 Jan 2020 13:34:00 -0800
Received: from mailout.endmonthnow.com [165.45.104.219] by snmp.otwaloow.com with SMTP; Fri, 31 Jan 2020 13:22:51 -0800
Received: from mtu23.bigping.com ([Fri, 31 Jan 2020 13:21:16 -0800])
by mtu23.bigping.com with SMTP; Fri, 31 Jan 2020 13:21:16 -0800
Received: from unknown (60.127.161.83)
by mail.naihautsui.co.kr with ASMTP; Fri, 31 Jan 2020 13:12:12 -0800
Message-ID: <FBBFA25D.6BA59961@goodline.info>
Date: Fri, 31 Jan 2020 13:12:12 -0800
From: =?utf-8?B?IkFsZWlzaGEiIDxBbGVpc2hhQGdvb2RsaW5lLmluZm8+?=
User-Agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)
MIME-Version: 1.0
To: <xxxx@knowbase.co.za>
Subject: =?utf-8?B?SSBNaXNzZWQgRnVja2J1ZGR5IE1lc3NhZ2U=?=
Content-Type: text/html;
charset="utf-8"
Content-Transfer-Encoding: base64
X-Envelope-Sender: Aleisha@goodline.info
X-ME-Spam: Low (45)
Return-Path: <Aleisha@goodline.info>