Question Author
Sammy, Thank you so much for trying to help. I'll try to explain a little more.
I have an email address - Jo Bloggs@bt.com
My personal domain is MyHome.co.uk, to which my emails come, via BT, addressed to Naomi@.MyHome.co.uk
In addition to Jo Bloggs@bt.com, I've now set up Naomi@bt.com which works perfectly well sending and receiving....
.... but since I set that up, I can receive email to naomi@MyHome.co.uk, but can't send email from that address.
I use Outlook Express.
I really would be most grateful for any advice.