your office PC), please take immediate action to clean up the virus. If the concerned IP address belongs to your computer (e.g. ), it means the computer was connected with the CityU main campus network (including dial-up service and VPN). If the IP address starts with 144.214 (e.g.You should focus on the last "Received:" header line (the one before the "Date:" header), especially the IP address (usually shown in the format as ).(ii) If the "real_hostname" presents but differs from the "apparent_hostname", trust the "real_hostname". Note: (i) Sometimes the "real_hostname" is absent. Received: from apparent_hostname ( real_hostname ) by. Read the full headers of the concerned email which usually is enclosed in the notification.(b) If you want to find out the source machine of the virus-infected email, please: (a) If you are sure your computer has not been infected by any virus, you may simply discard the notification. When you receive such an email undeliverable notification, you can: Those worms/viruses have caused a lot of disturbance, annoyance, confusion and misunderstanding to email users as well as administrators! You can obtain more information of them from the following links:.
That is why you received an undeliverable notification for an email that you have never sent. As a standard procedure, when a mail server detects an email with virus or unsafe file, it will reject the mail and send an undeliverable notification to the "sender". If your email address was found in the infected computer, it could be picked up by the virus to fake the sender address. The virus-infected email was actually sent by the virus itself from an infected computer (this neither means it is your computer, nor means it is located in the CityU network) automatically! The sender address that appeared in the infected email was randomly chosen by the virus from the address book or mailbox of the infected computer. This kind of email is in fact related to the spreading of some massing-mailing virus/worms (e.g. Mailer-Daemon) saying that your email sent to someone was rejected because it contains a virus or an unsafe file. You may have experience in receiving an undeliverable email notification from an email server (e.g. Why did I receive an undeliverable notification for an email that I have never sent?
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