Overview

The purpose of this article is to provide solutions steps for when some emails from the FaxMaker server are being rejected by the mail server with SMTP error 501 5.1.3.  This could also be recognized initially as your mail server rejecting some messages from the FaxMaker server in the mail server logs with the address do_not_reply@faxmaker.com.  

Environment

Any FaxMaker installation with version 19.2 installed. 

Solution

The FaxMaker SMTP log - smtpin.fmlogger shows the following SMTP errors when the emails are sent and auto-update fails:

2018-07-16,14-26-38, , , ,Failed - SMTP protocol error. 501 5.1.3 Invalid address.
2018-07-17,19-50-25, , , ,Failed - SMTP protocol error. 501 5.1.3 Invalid address.

The To: field is blank in the generated email which causes the SMTP error from the receiving mail server. This can be verified by following the steps below:

1. Navigate to C:\Program Files (x86)\GFI\FaxMaker\in\undeliverable
2. There should be .queued files.  Open one of the emails in notepad and the beginning looks like this:
   
   MAIL FROM: <do_not_reply@faxmaker.com>
   RCPT TO: <>
   DATA
   MIME-Version: 1.0
   Precedence: bulk
   Errors-To: errors@faxmaker.com
   From: do_not_reply@faxmaker.com
   To: 
   Subject: [GFI FaxMaker] Auto Update: 8 update(s) failed to install
   Content-Type: multipart/alternative;boundary="----=_NextPart_000_0096_01CDF62F.ABCA7380"
   Date: Wed, 08 Aug 2018 16:00:28 -0400

Current Behavior

The email is generated with blank To: field.

Expected Behaviour

The generated email should have fax administrators email address in the To: field.

This was an issue in build 19.2 of FaxMaker and was fixed in version 20.  The How to Upgrade FaxMaker article describes the upgrade process.  

Confirmation

After upgrading FaxMaker to version 20, the issue of the empty To: field in FaxMaker administrative emails will no longer be present.