GMS attempted to connect to the remote server in order to deliver an email message and a connection was made. However, the remote mail server did not return a success code so GMS will treat this as the server not being available.
In this case, session Undefined connected to port Undefined of the server at Undefined and got the response Undefined from the remote server.
No action is required by you. GMS will automatically recover from this problem.
Keywords:select timed out failed connection 8278