• The plugin waits for each mail, until the Madrill API gives status back for sending the mail, and routes then an undelivered mail through wp-sendMail instead.

    This has to large negative consequences:
    – long processtime -> Mandrill is no queuing/transaction system as each mail is treated individually, and not delivered as a batch
    – Sending spam. -> Mandril has an “unsubscibe”-option. When a recipient has unsubscibed, the API returns an “undelivereable” and the plugin then routes the mail through wp.sendmail -> the result is that the user gets the mail anyway -> spam

    https://wordpress.org/plugins/wpmandrill/

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