Fix more potential race condition in sending emails

Editor assessment

The subject 'Fix more potential race condition in sending emails' raises flags: 'more' presumes knowledge of a prior fix, the article is off ('a race condition' or 'race conditions'), and a race-condition repair is arguably a fix: with real user impact, not chore: — the type choice affects whether it surfaces in changelogs at all. 'emails' would serve as a scope. The body contains only a valid Signed-off-by footer, correctly formatted, but no description of the race: which operations interleave, what corruption or duplicate mail resulted, and what synchronization was added. The header's mechanics are fine, and chore commits correctly skip version bumps. As a record, though, the message names a scary class of bug and then explains nothing about it.