Some time will prompt this error when send mail, and may wait 1~2 hours than can be sent.

1

Some time will prompt this error when send mail, and may wait 1~2 hours than can be sent. 
anyone know whats the problem of it.

2

Hi Jaye,
could you please open the third tab in the same window (titled ‘Log’, right next to the Error tab) when this error pops up next time and copy it for me here?

Regards,
Olivia