https://bugs.llvm.org/show_bug.cgi?id=40190

            Bug ID: 40190
           Summary: When rewriting the `From:` email header, need to add
                    real sender to `Reply-To:` header.
           Product: Phabricator
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedb...@nondot.org
          Reporter: chandl...@gmail.com
                CC: llvm-bugs@lists.llvm.org

When Phabricator is sending email on my behalf, it will rewrite the `From:`
header in order to avoid DMARC issues. This is good (if a frustrating
necessity).

However, unlike the mailing lists, Phab does not take the original contents of
the `From:` header and put them into the `Reply-To:` header. This is bad for
many reasons. First, it makes it hard (impossible?) to reliably detect what
email address is associated with the sender. Second, replies may fail to
include the sender which is surprising.

Here is the doubly re-written `From:` header from one such phab update:
```
From: Chandler Carruth via Phabricator via llvm-commits
<llvm-comm...@lists.llvm.org>
```

And here is the `Reply-To:` header showing the original `Reply-To:` added by
Phab to capture responses, and the list has added Phab's `From:` into it, but
we have lost the original author email:
```
Reply-To: reviews+d56162+public+e080bc19d9bb3...@reviews.llvm.org, Chandler
Carruth via Phabricator <revi...@reviews.llvm.org>
```

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