I've updated the function and incorporated your suggestions.
Let me know if this addresses your concerns.

On 17/09/2021 18.21, sebb wrote:
On Thu, 16 Sept 2021 at 16:04, sebb <[email protected]> wrote:

On Thu, 16 Sept 2021 at 01:54, <[email protected]> wrote:

This is an automated email from the ASF dual-hosted git repository.

humbedooh pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-ponymail-foal.git


The following commit(s) were added to refs/heads/master by this push:
      new ae41562  fake a From line if none found.
ae41562 is described below

commit ae41562bc53e84a8645d60a63aac58bd444acad9
Author: Daniel Gruno <[email protected]>
AuthorDate: Wed Sep 15 19:54:30 2021 -0500

     fake a From line if none found.
---
  server/endpoints/mbox.py | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/server/endpoints/mbox.py b/server/endpoints/mbox.py
index 001f8ce..59cfc01 100644
--- a/server/endpoints/mbox.py
+++ b/server/endpoints/mbox.py
@@ -25,12 +25,17 @@ import re
  import typing
  import aiohttp.web
  import asyncio.exceptions
+import time


  async def convert_source(session: plugins.session.SessionObject, email: dict):
      source = await plugins.messages.get_source(session, permalink=email.get("dbid", 
email["mid"]))
      if source:
          source_as_text = source["_source"]["source"]
+        # Ensure it starts with "From "...or fake it
+        if not source_as_text.startswith("From "):
+            from_line = "From MAILER-DAEMON %s\n" % time.strftime("%a %b %d 
%H:%M:%S %Y")
+            source_as_text = from_line + source_as_text

-1

Unconditionally using the current time is not ideal.

The LUA version extracts the time from the message if it can:

https://github.com/apache/incubator-ponymail/blob/6032eff400c2549f77ff1b6682a6e4d2ab214263/site/api/mbox.lua#L44

Furthermore, rather than using what appears to be a valid time (i.e.
now) if the date cannot be parsed, it would be better to use a date
such as 1/1/1970 to better indicate that the timestamp is not known.

          # Convert to mboxrd format
          mboxrd_source = ""
          line_no = 0

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