Hi,
This is generally caused by a clash between multiple FormMails running on the server.
If you're using version 2.12 that almost certainly isn't the reason, unless you've got two FormMails running on different domains with exactly the same $TARGET_EMAIL setting (pretty unlikely).
If you know how to create a world-writable directory on your server, you can set SCRATCH_PAD configuration in FormMail and that should solve the problem.
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