Got tens of these warnings per day in the log ... anyone know who to prevent them?

[warning] ContactId not known to attach header for this transactional email by Sparkpost extension possible duplicates email hence skipping: email@address.com

Probably no big deal, but it's hard to find the real issues in the sea of these littering the log. Thanks!

(CiviCRM 5.50.3; SparkPost Integration 1.5; Joomla 3.10.10)


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