I had a strange email returned from a colleague today.

He sent me a screen capture of an email from me that got flagged up on his MacBook Pro.

This email was sent only to him and yet had multiple email addresses of people that I know in it too. There was also a line in it showing http://themythoffargus.com/give.php?steve

I ran antivirus and malwarebytes and nothing flagged up.

Has anyone else had strange stuff going on?

I am running Windows 10.