Troubleshooting Email Sending Issues in WHMCS 7.x: A Comprehensive Guide

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This article is for WHMCS 7.x.

If emails are not being sent by your WHMCS installation or they are not formatted in the manner expected. Follow these troubleshooting steps

Navigate to Utilities > Logs > Activity Log

Review the logs for any error messages at the time of email sending.

Could not instantiate mail function

Could not connect to SMTP host

Could Not Authenticate

Sender Verify Failed

Syntax Error

Smarty Error: Not allowed by security policy

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