[PR #7740/671b7ab1 backport][stable-8] mail module: add Message-ID header (#7764)

mail module: add Message-ID header (#7740)

* mail module: add Message-ID header

* Update plugins/modules/mail.py

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 671b7ab149)

Co-authored-by: Sébastien Bocahu <sebastien+github@bocahu.name>

changelogs/fragments/7740-add-message-id-header-to-mail-module.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - mail - add ``Message-ID`` header; which is required by some mail servers (https://github.com/ansible-collections/community.general/pull/7740).

plugins/modules/mail.py

@@ -222,7 +222,7 @@ import smtplib
 import ssl
 import traceback
 from email import encoders
-from email.utils import parseaddr, formataddr, formatdate
+from email.utils import parseaddr, formataddr, formatdate, make_msgid
 from email.mime.base import MIMEBase
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
@@ -349,6 +349,11 @@ def main():
     msg['From'] = formataddr((sender_phrase, sender_addr))
     msg['Date'] = formatdate(localtime=True)
     msg['Subject'] = Header(subject, charset)
+    try:
+        msg['Message-ID'] = make_msgid(domain='ansible')
+    except TypeError:
+        # `domain` is only available in Python 3
+        msg['Message-ID'] = make_msgid()
     msg.preamble = "Multipart message"
 
     for header in headers: