Spam filtering system and method
US9177293B1 · kind B1 · utility
339Cited by
5References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2007 |
| Grant date | Nov 3, 2015 |
| Priority date | — |
| Expiry date | Dec 24, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L51/212
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
A spam filter system and method, for maintaining at least one database of permitted email addresses; automatically communicating with an email server, and selectively downloading and storing email not corresponding to entries in the database; automatically sending a challenge message in response to messages from non-permitted email addresses; if an appropriate response is received to the challenge message, adding the non-permitted email address to the database of permitted email addresses; and automatically restoring downloaded email messages from email addresses which become permitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.