email Problem

Hi, community builder send no emails. No Confirmation mail after registration, not after resend confirmation, no mass send mail.
But the mail test from joomla system is working and sends mail.
When i press the resend confirmation button i get the message:
Sent confirmation emails to 1 users
But i will not receive it ?
Joomla 4.4.2 
Community Builder: 2.9.1
Kunena: 6.2.3

Any idea what could be wrong here ?

Best regards
Gunter
 

If the email says it sends without any errors it typically means it's failing at the mail server. Within CB > Configuration > Registration ensure the From Address is valid for your domain or left empty so it uses whatever is set in Joomla global configuration. Try contacting your host and have them check the mail server logs to see if there's any outbound emails being blocked. It's also possible the emails are sending, but are being put in the spam folder so be sure to check your emails spam folder.

okay, at least it was a spam problem. Not so easy to detect because some mails are working, some not.
But now after change from php mail to SMTP mail all mails are senden and received.
Thanks for helping 
Best regards
Gunter