Recently I found out that one of my emails has been sending out spam that was being bounced back to me (via the mailer daemon) for years. Fortunately it's not one of my main emails, but it's still scary. I have no contacts, but I did use the address to send a few emails, and the recipients of those emails are the addresses that are being sent spam (I presume), and that are bouncing back. Then today I found out another email of mine has the same problem (though again, not a main one), so I'm even more confused.
I've changed all the passwords/secret answers, and have scanned with everything I have for viruses etc. Thing is, I always scan regularly and it never turns up much, and the emails have been bouncing back for years, and never to a new email address, so what could it be? I just want to know if it's my password (though I'd say they weren't easily guessable), or a spambot or whatever, before I go ahead and overhaul all my emails/passwords.
So to summarise:
* Mailer daemon has been bouncing back emails that were sent to addresses in my sent box
* The email contains a link at the bottom that presumably leads to a virus or dodgy site or whatever
* It's been happening for years despite frequent virus/adware/spyware scans that don't turn up anything (but I only became aware of it recently)
* I've changed all passwords/secret info, but would just like an explanation, and to know if I really need to be worried or not.
* I have the emails that bounced back, so I could copy and paste the contents, if it's necessary and safe for me to access the email again.
Please help! Thanks!