It appears that my email account has been hijacked and is being used to send out Spam.
The evidence of this is that I am getting 100's of messages from the Mailer Daemon saying that some of these Spam messages are undelivarable.
Becasue I am not sending these emails to begin with leads me to believe someone has hijacked my email account.
Is there any way I can stop my email account from being used as the source of this Spam.
Change your email password immediately John. If you login to webmail and click on settings you will see the password option.
There's been a few reports of this today.
As mentioned change the password but if its oinly 'undeliverables' you are getting then its probable someone is spoofing your email address to send out spam. So they're not coming from your account but they will get sent back that way if undeliverable. Check your SENT folder. It should not have any of these emails?