Systems, methods, and computer program products for alerting system administrators and owners about suspect communications, such as communications from open relay, blacklisted, and blocked computers, are disclosed. Embodiments comprise receiving information related to a communication of an electronic document from one computer to another, determining if the sending computer is either blacklisted, and alerting the administrator or owner of the sending computer if it is identified as suspect. In some embodiments, determining if the sending computer is suspect comprises examining blacklisted IP addresses and/or blacklisted domain names. Some embodiments determine the identity of the administrator by examining WHOIS database information. In some embodiments, alerting the administrator or owner comprises sending them an e-mail.