# After attempting to send test emails Error 500 - Mautic 4.4.9 PHP 8.1 **URL:** \ **Category:** Mautic 4 Install/Upgrade Support\ **Created:** [June 23, 2023, 3:30pm UTC](https://forum.mautic.org/t/after-attempting-to-send-test-emails-error-500-mautic-4-4-9-php-8-1/28414 "2023-06-23T15:30:15Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![digitalcuritiba](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/digitalcuritiba/32/10061_2.png) [@digitalcuritiba](https://forum.mautic.org/u/digitalcuritiba)\ **Post date:** [June 23, 2023, 3:30pm UTC](https://forum.mautic.org/t/after-attempting-to-send-test-emails-error-500-mautic-4-4-9-php-8-1/28414/1 "2023-06-23T15:30:15Z")
Mautic 4.4.9 PHP 8.1 DB: Server-Version: 5.7.42 - MySQL Community Server (GPL) Hello! 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 ---
**Author:** ![joeyk](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/joeyk/32/11164_2.png) [@joeyk](https://forum.mautic.org/u/joeyk)\ **Post date:** [June 23, 2023, 3:36pm UTC](https://forum.mautic.org/t/after-attempting-to-send-test-emails-error-500-mautic-4-4-9-php-8-1/28414/2 "2023-06-23T15:36:48Z")
Hi, the email address you try to send to is not correct.