Ansible Mail Test

This repo demonstrates that the Reply-To header can only be set if the character set of the email is US-ASCII when using the Ansible Mail module, see this issue.

Clone this repo and then run the bash script with the first argument being a remote server with Exim set to accept email from local users, you will be prompted for an email addess to send the mail to:

./mail.sh server.example.org
Email address to send to: you@example.org

It will then attempt to sent 2 emails to you:

1. A US-ASCII email with the header Reply-To=test@example.org
2. A UTF-8 email with the header Reply-To=test@example.org

The first email will work, the second email will fail with:

TASK [mail : UTF-8 Email sent to you@example.org] ******************************************************************************************************
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: SMTPDataError: (550, 'header syntax')
fatal: [server.example.org]: FAILED! => {"changed": false, "msg": "Failed to send mail to 'you@example.org': (550, 'header syntax')", "rc": 1}
...ignoring

The Exim logs on the server documents this failures:

2019-06-29 11:03:20.784 [10043] 1hhB8a-0002bz-OP H=localhost (server.example.org) [127.0.0.1]:50190 I=[127.0.0.1]:25 F=<root@server.example.org> rejected after DATA: header syntax (unqualified address not permitted: failing address in "Reply-To:" header is: =?utf-8?q?test=40example=2Eorg?=): unqualified address not permitted: failing address in "Reply-To:" header is: =?utf-8?q?test=40example=2Eorg?=

The reason:

unqualified address not permitted:
  failing address in "Reply-To:" header is:
    =?utf-8?q?test=40example=2Eorg?=