Hi

I cannot send any email from my hotmail at all. Receiving is fine. 

When I do, I get an "undeliverable" email from the System Administrator - even though the sending address exists.

I have my own business so it's essential I can send emails. 

I have now had 2 requests from Windows to verify my account due to supposedly 'suspicious activity' (ie. me sending emails from my own account! imagine!!) and I've done the verification code to my phone thing and it's made no difference. I still can't send a single email with or without attachments.

As a small business I am very frustrated by this and and considering cancelling my Hotmail altogether and using gmail instead. Can someone please help.