False Positives

False Positives are legitimate messages that are mis-classified as spam or as a virus by the UVSC E-Mail Firewall or the Avinti iSolation Server. This page is designed to help you understand why messages are sometimes mis-classified and how you can ensure they aren't mis-classified in the future.

Why messages are sometimes mis-classified as spam

RBLs

The UVSC E-Mail Firewall blocks messages from lists of known spammers. These lists are called RBLs (Realtime Block Lists) are maintained by people all over the world. Accuracy of the specific lists used by the UVSC E-Mail Firewall is extremely high - 99.999% accurate. Occasionally, one of the lists becomes out of date or is simply wrong and a legitimate sender is blocked.

Free E-Mail Accounts

Free e-mail systems like Hotmail, Yahoo, Juno, etc. are considered suspect. While the majority of users of free e-mail accounts are legitimate senders, spammers also use these free resources to send their wares. Messages from these systems aren't blocked automatically, but these messages are treated with more caution than the average and sometimes get blocked if the content of the message looks funny or if the Bayesian Analysis shows it might be spam.

Ensuring legitimate messages aren't blocked

Classify as Not-Spam

If a message is quarantined and you want messages like it to be allowed in the future, you can choose to classify the message as Not-Spam. This teaches the system to allow this type of message in the future.

Whitelist

You may whitelist any sender or sending domain (the part of the address after the "@"). This is done in the Quarantine Preferences. Whitelisting will allow any message from the sender unless an attachment contains a virus.

Contact e-mail administrator

You may contact the e-mail administrator to discuss any problem with receiving a message. We will be happy to discuss the problem with you and work out an acceptable solution.