fix(projekt-matching): add Date and Message-ID headers to outgoing mail

projekt-matching/projektmatch/mailer.py

@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 import email
+import email.utils
 import imaplib
 import smtplib
 import ssl
@@ -71,6 +72,8 @@ class MailBox:
 def send_mail(user, password, to, subject, body):
     msg = EmailMessage()
     msg["From"], msg["To"], msg["Subject"] = user, to, subject
+    msg["Date"] = email.utils.formatdate(localtime=True)
+    msg["Message-ID"] = email.utils.make_msgid(domain="destengs.com")
     msg.set_content(body)
     with smtplib.SMTP(SMTP_HOST, SMTP_PORT, timeout=30) as server:
         server.starttls(context=ssl.create_default_context())

projekt-matching/tests/test_mailer.py

@@ -51,3 +51,5 @@ def test_send_mail_starttls():
     server.login.assert_called_once_with("u@x", "pw")
     msg = server.send_message.call_args.args[0]
     assert msg["Subject"] == "Subj" and msg["To"] == "to@x"
+    assert msg["Date"]
+    assert msg["Message-ID"].endswith("@destengs.com>")