#gh-75705: Set unixfrom envelope in mailbox._mboxMMDF

[matthieucan]

The mailbox._mboxMMDF mailbox format does not set the unixfrom envelope, i.e. the From foo@bar blah header. from and unixfrom are tracked separately in this class.

#75705

• Issue: mailbox._mboxMMDF.get_message throws away From envelope #75705

[serhiy-storchaka]

I slightly polished the PR.

LGTM.

[miss-islington-app]

Thanks @matthieucan for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11, 3.12.
🐍🍒⛏🤖

[bedevere-app]

GH-115098 is a backport of this pull request to the 3.12 branch.

[bedevere-app]

GH-115099 is a backport of this pull request to the 3.11 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD14 3.x has failed when building commit 76108b8.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1232/builds/1266) and take a look at the build logs.
4. Check if the failure is related to this commit (76108b8) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1232/builds/1266

Failed tests:

• test.test_multiprocessing_fork.test_processes

Summary of the results of the build (if available):

==

Click to see traceback logs

remote: Enumerating objects: 11, done.        
remote: Counting objects:  11% (1/9)        
remote: Counting objects:  22% (2/9)        
remote: Counting objects:  33% (3/9)        
remote: Counting objects:  44% (4/9)        
remote: Counting objects:  55% (5/9)        
remote: Counting objects:  66% (6/9)        
remote: Counting objects:  77% (7/9)        
remote: Counting objects:  88% (8/9)        
remote: Counting objects: 100% (9/9)        
remote: Counting objects: 100% (9/9), done.        
remote: Compressing objects:  12% (1/8)        
remote: Compressing objects:  25% (2/8)        
remote: Compressing objects:  37% (3/8)        
remote: Compressing objects:  50% (4/8)        
remote: Compressing objects:  62% (5/8)        
remote: Compressing objects:  75% (6/8)        
remote: Compressing objects:  87% (7/8)        
remote: Compressing objects: 100% (8/8)        
remote: Compressing objects: 100% (8/8), done.        
remote: Total 11 (delta 1), reused 1 (delta 1), pack-reused 2        
From https://github.com/python/cpython
 * branch                  main       -> FETCH_HEAD
Note: switching to '76108b8b05040fc49a6bc50eb2e990576595c57c'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 76108b8b05 #gh-75705: Set unixfrom envelope in mailbox._mboxMMDF (GH-107117)
Switched to and reset branch 'main'

configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.