change your password...something similar happened to me a while ago and it sent emails to most of my contacts... i changed password and it seemed okay after that
I changed my password after people got fake emails from me [i as someone had obviously hacked my account and got into my contacts list. I wouldn't have though it was necessary just because [i] you ] have got one, unless perhaps you clicked on a link in them.
There's a school of thought that you should change your passwords frequently anyway, but I haven't; too much grief trying to remember a new one every month.
malwarebytes doesn't stop you getting fake emails but it removes any malware they may try to install on your computer. You have to run a scan with it, though, it isn't switched on all the time.
I promise not to open any email from you. So that'd be [email protected] then.
In fairness I suspect looking at my e-mails are unlikely to cause me too much grief. I have good AV running and I don't have PIN stored on my PC. I suspect any such e-mails would be found in the spam folder anyway.
I'm not aware that opening emails causes problems (other than to alert the sender that yours is a valid email address)- the problems come from opening any attachments