24-Hour WordPress Contact Form Repair

I run an antique restoration business in Australia and our WordPress “Contact Us” form is failing—visitors see an “Error messages when submitting form” notice and no enquiry ever reaches my inbox. Each missed message is a lost lead, so I need the fault isolated and resolved today.

Here’s what I expect by this time tomorrow:
• Identify the root cause of the send-fail error (theme conflict, plugin issue, SMTP settings, DNS, PHP mail—whatever it may be).
• Restore full functionality and confirm enquiries land in the correct mailbox.
• Run at least three real-world test submissions and forward the headers so I can see proof of delivery.
• Provide a concise summary of the fix and any configuration changes for future reference.

You’ll have full WordPress admin access and cPanel if required. Please be comfortable with common form plugins, WP-Mail, SMTP tools, DNS/MX checks, and basic PHP debugging. I’m available for quick responses during Australian business hours but can grant credentials immediately, so you can start as soon as you’re hired.