Hey Joey
There was a merged pull request regarding this multi threading sending:
Relevant part is this info from kuzmany:
The thing is I don’t know if this ever happened in mautic swiftmailer:
Also need fix in swiftmailer Add flock lock on message during queue flushing by Dcoutelle · Pull Request #1270 · swiftmailer/swiftmailer · GitHub
So maybe a patched is needed.
This would be the patch:
https://patch-diff.githubusercontent.com/raw/swiftmailer/swiftmailer/pull/1270.diff
So I think this patch is still needed (Because I apply in mautic 4.4.10 and it was applied cleanly)
To apply just do in the mautic root:
cd vendor/swiftmailer/swiftmailer
curl -L https://patch-diff.githubusercontent.com/raw/swiftmailer/swiftmailer/pull/1270.diff | git apply -v
Should output something like:
Checking patch lib/classes/Swift/FileSpool.php…
Applied patch lib/classes/Swift/FileSpool.php cleanly.
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