What is a false positive?
Definition: a false-positive email is a legitimate email that is marked as spam or rejected by spam filtering or security filters. False-positive emails can be annoying for users as they may miss important or urgent emails.
How does false-positive detection work?
False-positive email detection is carried out by spam or security filters that use algorithms to determine whether an email is legitimate or not. The algorithms use a variety of techniques to analyse the e-mail, including analysis of the e-mail header, analysis of the e-mail content and analysis of the sender’s behaviour.
The false positive rate is the percentage of legitimate e-mails wrongly identified as spam by anti-spam. False-positive and false-negative rates are measures of the quality of an antispam solution. The lower these rates are, the better the solution performs. However, these two rates always vary inversely. Altospam favours reducing the more damaging false-positive rate as much as possible, which is why it is very close to zero.