While sending out a newsletter to 52 recipients, I kept getting: "Error sending email. Please check outgoing email settings"
I would click "OK" then Pause and then Continue and the process would start again. However, I would get the error again after just a few more were sent.
I am using GoDaddy SMTP, set to send no more that 200 per day, and pause 5 seconds between emails. Screenshot of error attached.