Gmail addresses in Reply To field cause error: Could not instantiate mail function

I have a contact form which includes a required Email field. The form notification From Email matches the site domain, and the Reply To field is the visitor’s email address from the form: {Your Email:2}

Notification emails where the web visitor enters a gmail account cause this error: WordPress was unable to send the notification email. Could not instantiate mail function.

All other visitor email accounts work and the notifications send as expected. If I leave the Reply To field empty, the notification works.

Any ideas? Thanks!

Chances are the issue is with your outgoing mail server. You can start with these instructions for troubleshooting:

If you need assistance, please open a support ticket:

And include the following:

The form export:

Your system status report:

Thank you.

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