Merge #2275

2275: Fix2274: Inbound emails are rejected r=mergify[bot] a=nextgens

## What type of PR?

bug-fix

## What does this PR do?

Fix email reception

### Related issue(s)
- closes #2274

## Prerequisites
No documentation as this affects only people running master since yesterday

Co-authored-by: Florent Daigniere <nextgens@freenetproject.org>
Co-authored-by: Florent Daigniere <nextgens@users.noreply.github.com>

core/admin/mailu/internal/views/auth.py

@@ -12,7 +12,7 @@ def nginx_authentication():
     """
     client_ip = flask.request.headers["Client-Ip"]
     headers = flask.request.headers
-    if headers["Auth-Port"] == '25':
+    if headers["Auth-Port"] == '25' and headers['Auth-Method'] != 'none':
         response = flask.Response()
         response.headers['Auth-Status'] = 'AUTH not supported'
         response.headers['Auth-Error-Code'] = '502 5.5.1'