problem sending emails

I installed a server version at 1 & 1 this side everything is ok.

When I send emails in the email section I have an error message

“MyMessage” was sent but with some failures.

0 sent 3 failure "

Is there a setting somewhere to do to make it?



log : [2016-03-22 09:36:08] mautic.ERROR: [MAIL ERROR] Sending failed for one or more recipients [] []

Thank you for your help

I installed a server version at 1 & 1 this side everything is ok.
When I send emails in the email section I have an error message
“MyMessage” was sent but with some failures.
0 sent 3 failure "
Is there a setting somewhere to do to make it?

log : [2016-03-22 09:36:08] mautic.ERROR: [MAIL ERROR] Sending failed for one or more recipients [] []
Thank you for your help