David64, you are a legend! It appears that changing the server port numbers has worked. I will keep an eye on that as it still took a little while to send after changing those but it is up and sending again.  It was showing as a pop up with every email I tried to send and the emails would remain in the outbox every time. I am very grateful that it appears you have resolved the problem for me. Thank you very much for your time and help :)  ... View more

Hi David,  Thanks for your response. The 'clear text authentification is ticked'. I ticked ' my server requires authentification' but it's still not able to send emails out, the same spam error shows up with or without it selected.  ... View more