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EMAIL BOMBING, SPAMMING AND SPOOFING

Email bombing refers to repeatedly sending emails to fill up a mail gateway or a mailbox. Email spamming refers to the sending of unwanted email to users. Both email bombing or spamming resulted in flooding the Internet with unwanted junk emails. Email bombing/spamming attackers usually hijack other mail servers, and use them to send the emails.
Email spoofing refers to emails in which the sender or other parts of the email header are manipulated to appear as from a different user or source with impersonated identity. Email bombing/spamming may be combined with email spoofing, making it more difficult to determine who actually sent the email.

If mail servers are not properly configured, they may suffer from these kind of email attacks. The mail system may crash, overload or even lose internal data because all available resources are plundered by the spammers. The cost of recovery to normal service may also be high.
Examples of symptoms of email attacks are:
• Denial of service such as disk full or system shut down.
• Large number of incoming/outgoing emails from same originator in a very short period of time.
• Large number of incoming/outgoing emails from invalid source address or to non deliverable address.
• Incoming/outgoing emails from an unknown source.
• Emails claiming to be from the administrator requesting users to send a copy of their passwords or other sensitive information.
• Emails requesting users to change their passwords to a specified value or string.
• Emails redirecting users to fraudulent website that appears to be a legitimate organisation, for the purpose of gaining personal identity and private information, such as credit card information.

Listed below are some points for protecting from email bombing, spamming and spoofing:

• Remove unused mail daemons such as Sendmail if not used. Keep mail gateway software up-to-date when used.