After attempting to send test emails Error 500 - Mautic 4.4.9 PHP 8.1

Mautic 4.4.9
PHP 8.1
DB: Server-Version: 5.7.42 - MySQL Community Server (GPL)

In the email configuration, when testing the connection, I receive: success.

However, after attempting to send test emails, I receive the following error:
500 - mautic.CRITICAL: Uncaught PHP Exception Swift_RfcComplianceException: “Address set in PathHeader does not comply with addr-spec of RFC 2822.” at /home/

Thank you for your response.

Rolf Rostock

Hi, the email address you try to send to is not correct.