Failed to Send Preview but send test email in outgoing settings

Hello I recently updated a multisite account with cloner, and now I am having a sending problem with enewsletter.

After creating a newsletter and sending preview, I get a failure message "Failed to send test email! Make sure that entered email is correct and also check outgoing email settings."
I know my email address is entered correctly, and when I check outgoing settings the test connection sends a test mail just fine. Any suggestions? Thanks!