I have sent quite a few emails today and they have all gone, except one. This is my first week with OL2013, I previously used OL2010. The mail that won't go is to about 30 addressees and does not have any attachments. I have sent a similar email to the same 30 people in OL2010 without any problems. I notice that the Send/Receive box flashes up momentarily and does not bear any message. The Cancel All and Work Offline boxes each contain a 'red cross', which I assume means that it is not available to use. What is going wrong with this please????