[ILUG] Another SPAM question

[Oliver]

  Hello, Today I got spam email from my server. Or specifically from
anonymous at .com [1]. The mail was sent to the email address that is listed
in whois for my server. Is this a situation where the spammer faked the
sender email (anonymous at .com [2]) knowing that would get through the spam
check? Or should I be worried? Everytihng is locked down at work so I can
login to my system. - Ollie

Links:
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[1]
mailto:anonymous@<myserver>.com
[2] mailto:anonymous@<myserver>.com