I'm sure this question has been asked before, but can someone assist please.
I am finding that email is being sent from my computer en=ven though I have mcafee and it says there are no infections on my computer.
It could be that someone who has you in their address book has malware that is spoofing you as the sender. Or, in rare cases, it has been known for an ISP's webmail servers to be hacked.
If you don't see any items in your sent mail box then the chances are it isn't you who is actually sending them.
To be on the safe side run Stinger and Malwarebytes Free, both linked in the last clickablke link in my signature below.