No mail sent after backup

Hello,
after starting a backup, no email is sent after the backup even though. I have entered an email address. Sending emails for voice messages works without any problems. Where can I find the relevant logs? Why is no email sent after the backup? Whether the backup log informs you that a message is being sent.

2545	[2024-11-21 10:42:02] [10053c36-df5c-480f-9815-c4b33d7c3202.INFO]: Finished Cleaning up [] []	
2546	[2024-11-21 10:42:02] [10053c36-df5c-480f-9815-c4b33d7c3202.INFO]: Finished created backup file: 20241121-104200-1732182120-16.0.40.11-572172703.tar.gz [] []	
2547	[2024-11-21 10:42:02] [10053c36-df5c-480f-9815-c4b33d7c3202.DEBUG]: Generated Backup process result email to [email protected]. Status: Success [] []

FreePBX & Asterisk Version

[global]
type=global
user_agent=FPBX-16.0.40.11(20.10.0)

Please help.
Greetings from Stefan Harbich