Hi,
I had created a code unit which was responsible to get the customer names and send in email i created that code unit to test the background job functionality for testing purpose and left it for some days with Ready status.
From today i am unable to send the email to my gmail account or outlook account from business central dynamics 365.
Here is the screenshot of the error. I found this from the dashboard showing failed emails so i loaded the failed email and clicked on show error.

Is there any limitation in the sandbox or this issue is something else? i have tried to search this error but didn't get any information.
Any suggestions please how to fix this issue yesterday the system was sending the emails using the background job.
Few