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Hi. My client got the error today:
EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v2.1.1 logged this error during the last time it tried to send an email:
Mailer: Other SMTP
You must provide at least one recipient email address.
Please review your WP Mail SMTP settings in plugin area. Consider running an email test after fix it.
After a few tries it worked, but I’m worried about why this happened, there was no change in the plugin settings, could this be related to the mail server?