Sorry for posting in the wrong place
Have reloaded an unedited include/mailer.inc.php - so I'm back to scratch.
Have read and re read your help page, even sent a screen print to my hosting company asking for assistance.
They sent me the server details, including the port number, and they confirmed my SMTP username and password.
I have carried out all the permutations possible in the email settings from 'nothing entered, to all information entered. Mainly I get the message that says the email has been sent..... but nothing is received.
When I registered a normal username, I did receive an email saying 'Welcome to Coppermine etc.....). So the mailing must be working.
Does anyone have any ideas? Please!