[RSS Feed/News] Server Error Logs: Email to {email address} failed: Unable to send mail. src/XF/Mail/Mailer.php:307

[XenForo]

We have an SMTP relay in place through Mailchannels. When we send an email, we get dozens of the following error message:

Email to {email address} failed: Unable to send mail. src/XF/Mail/Mailer.php:307

How do I troubleshoot this issue?

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