How do spammers send from my email address?

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http://forums.fedoraforum.org – Just came across this link, please have a look. What does the author mean by the following sentence? Quote: First, your email administrator should publish an accurate SPF record for each domain you own. Second, your email system should sign all your outgoing email with DKIM. http://blogs.computerworld.com/15112..._email_address Thanks, (HowTos)