Sender plugin works, but it takes forever to send email notification letters

Sender plugin uses wp_cron. This is a WordPress function for periodic execution of any planned actions. This function depends on the traffic of your website: the more visitors you have, the faster letters will be sent.

You can also assign a priority to your letters. In that case letters with "Low" priority would have to wait until all "High" and "Normal" prioritized letters would be sent.

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