Getting 500 internal error when i click on submitt form

Your software
My Mautic version is: latest
My PHP version is: 8
My Database type and version is:

Your problem
My problem is: i have created a form and email then embedded the form using home code on my wordpress website. Now after I fill the form and click submitt, I get the error page, instead of the redirect. Also the customer email is not sent but the form response is captured

These errors are showing in the log:mautic.WARNING: PHP Warning - Undefined array key 1 - in file /home/destlcoh/public_html/crm/app/bundles/EmailBundle/Helper/MailHelper.php - at line 1783 {“hostname”:“premium129.web-hosting.com”,“pid”:144522} [2025-10-05T18:34:36.193277+00:00] mautic.CRITICAL: Uncaught PHP Exception Symfony\Component\Mime\Exception\RfcComplianceException: “Email “+bounce_68e2ba3c15ff0305775912@” does not comply with addr-spec of RFC 2822.” at /home/destlcoh/public_html/crm/vendor/symfony/mime/Address.php line 54 {“exception”:“[object] (Symfony\\Component\\Mime\\Exception\\RfcComplianceException(code: 0): Email \”+bounce_68e2ba3c15ff0305775912@\" does not comply with addr-spec of RFC 2822. at /home/destlcoh/public_html/crm/vendor/symfony/mime/Address.php:54)"} {“hostname”:“premium129.web-hosting.com”,“pid”:144522} [2025-10-05T18:42:44.086552+00:00]

Steps I have tried to fix the problem: