Date Last Reviewed:
08/30/2007
Some e-mail messages are blocked at the enterprise level regardless of settings users have made in CanIt. These enterprise block rules apply to ITS managed e-mail servers (GroupWise and Student E-Mail) and messages addressed to NIU E-mail aliases (alias@niu.edu).
When a sender attempts to send a message containing one of the following blocked components, a delivery failure message is returned to the sender's e-mail server. Depending upon that server's configuration, this error message may or may not be passed along to the actual sender. This means that the sender of such messages may not be notified that the message was blocked. Since this is a setting at the sender's server level, ITS has no control regarding if these error messages are received by the sender.
Messages that receive an excessive CanIt spam score (of over 20) will be blocked. This is regardless of any individual CanIt settings made by the intended recipient (even if the intended recipient has opted out of spam scanning altogether).
Since many worms and viruses propagate through the use of e-mail attachments, some attachments have been blocked at an enterprise level. If a specific attachment is required, ask the sender to rename it to a safe extension. For example, rename "patch.exe" to "patch.zzz" in order for the message to get through. As always, never execute any attachments that you are not expecting to receive from the given sender.
Messages with attachments of the following types are blocked.
Mail from the following domains are blocked:
Mail from the following IP addresses (hosts) are blocked:
Mail from the following e-mail addresses are blocked: