Spam is being sent from an email address say firstname.lastname@example.org. The email address is setup on Outlook, on 3 computers. 2 days ago I scanned the 3 computers and removed malware from 2 of them (one was heavily infected), then we changed the password for the email address. Just got a call today that someone just received a spam mail from the same email address. The spam mail recipients are people in the address book (for the mailbox that is spamming). Just had a copy of the spam mail that was received today, forwarded to me and there's just a url link in the body of the email. The spam email was sent to about 14 email addresses. How can I stop these spam emails from being sent from my email address?