Emails are not sent because of empty Recipients
This pending emails are caused by some Plugin - you have to configure all activated plugin(s) such as "Auto response plus". The emails are not sent because this not configured plugin causes the Recipient filed is empty such as the body of the email. Also in the Mail subject is mismatch. The error for this pending emials is described as "Recipients". So the only fix for this is to configure the plugin(s).
Updated:
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