PHP mail() not working after McAfee email protection implemented

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I use the formtoemailpro PHP script on my site to allow visitors to send me messages. This script has not been changed for a couple of years and has been working. The script uses PHP mail() to send the visitor's message to my email account. Today I implemented McAfee email protection for the domain and am no longer receiving messages from the script. I can send and receive emails from my domain email accounts, but the script doesn't seem to send emails anymore and there are no errors or bounce backs occurring. The script also sends emails to a gmail account and I am not seeing the emails there either. Has anyone experienced this before? I thought it may be related to email authentication, so I disabled DKIM and SPF, but it still did not work.
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JeffMa
Are you receiving any error messages? If you contact technical support, they will be able to provide you with any message logs available. Have you checked your spam folders to ensure that it was not simply detected as spam? Also, ensure that within your MX Entry section of cPanel, the mail delivery is set to Remote as the messages may be attempting to send the mail locally instead of remotely to McAfee.