{"id":4180,"date":"2020-10-30T21:40:26","date_gmt":"2020-10-30T20:40:26","guid":{"rendered":"https:\/\/webhosting.de\/?p=4180"},"modified":"2020-10-30T21:40:26","modified_gmt":"2020-10-30T20:40:26","slug":"spamassassin-la-proteccion-anti-spam-gratuita","status":"publish","type":"post","link":"https:\/\/webhosting.de\/es\/spamassassin-der-kostenlose-anti-spamschutz\/","title":{"rendered":"Spamassassin - La protecci\u00f3n gratuita AntiSpam"},"content":{"rendered":"<p>Cada d\u00eda se env\u00edan 28 mil millones de correos SPAM. Eso es una gran parte de todo el tr\u00e1fico de correo electr\u00f3nico y casi ninguna cuenta de correo electr\u00f3nico se salva de los correos de publicidad no deseada. Hasta ahora, la \u00fanica forma de proteger tu buz\u00f3n de ellos es un buen filtro de spam que funcione. SpamAssassin es otro de esos filtros de spam, pero es sobre todo su algoritmo, literalmente escogido a mano, y su alta flexibilidad lo que lo convierte en un software muy especial.<\/p>\n<h2>Un breve resumen<\/h2>\n<p>Aunque todo un equipo est\u00e1 trabajando ahora en el software, la piedra angular de SpamAssassin fue puesta por Justin Mason, quien anteriormente fue responsable de un programa similar llamado filter.plx. En 2001 las partes del programa fueron adaptadas y reescritas y renombradas como el nuevo proyecto \"Spamassassin\". Desde 2004 pertenece a la Fundaci\u00f3n de Software Apache y sigue siendo de c\u00f3digo abierto. Aparte de la naturaleza de c\u00f3digo abierto del programa, tambi\u00e9n hay una licencia que hace que el programa sea software libre, cuyo uso privado y comercial, por ejemplo como m\u00f3dulo de otro software de pago, es completamente gratuito.<\/p>\n<p>Una de las principales ventajas del software es su gran flexibilidad en cuanto al nivel de uso, ya que SpamAssassin puede utilizarse como aplicaci\u00f3n propia, como subprograma (m\u00f3dulo) de otro software, como programa cliente de un demonio de correo o como llamada a un MDA (Mail Delivery Agent) como Procmail. Importante: Aunque se incluyan diferentes instancias del software en la cadena de distribuci\u00f3n, el indicador no significa que el software no se vaya a utilizar. <a href=\"https:\/\/webhosting.de\/es\/e-mail-von-webhosting-account-trennen\/\">Correo electr\u00f3nico<\/a> analizado dos veces, lo que evita la redundancia de procesos y reduce la utilizaci\u00f3n de recursos.<\/p>\n<h2>As\u00ed es como funciona el proceso de clasificaci\u00f3n<\/h2>\n<p>SpamAssassin funciona seg\u00fan un sistema de puntos. Cada correo electr\u00f3nico entrante se analiza seg\u00fan determinados criterios y se le asignan puntos que indican la probabilidad de que sea <a href=\"https:\/\/webhosting.de\/es\/srs-mit-postfix-unter-centos\/\">Spam<\/a> actos. Un umbral ajustable por el usuario define el punto en el que el correo electr\u00f3nico se trata como spam y se clasifica. Para conseguir una puntuaci\u00f3n lo m\u00e1s precisa posible, el programa dispone de toda una serie de m\u00e9todos diferentes, como:<\/p>\n<p>- La lista blanca y negra basada en el DNS<br \/>\n- Filtro de suma de control de proveedores de c\u00f3digo abierto y comerciales como DCC o Vipul's Razor<br \/>\n- El filtro de expresi\u00f3n basado en <a href=\"https:\/\/webhosting.de\/es\/keywords\/\">Palabras clave<\/a> o frases clave<br \/>\n- El sistema Hashcash (prueba de trabajo)<br \/>\n- DIM y SPF<br \/>\n- Los listados de URL como salida de rastreadores como uribl.com<\/p>\n<h2>Filtro bayesiano<\/h2>\n<p>Adem\u00e1s de los sistemas de filtrado m\u00e1s o menos est\u00e1ticos, SpamAssassin tiene un algoritmo aplicado al filtro bayesiano que es capaz de \"aprender\" ciertas heur\u00edsticas, es decir, elementos recurrentes y distintivos, de los correos electr\u00f3nicos de spam ya enviados y as\u00ed adaptarse al comportamiento del usuario. El sistema se basa en el concepto de probabilidad de los byesianos, pero a menudo ha sido criticado porque un sistema de filtros no aprendido suele producir falsos positivos.<\/p>\n<p>Para evitarlo, se recomienda revisar primero los correos electr\u00f3nicos clasificados como spam m\u00e1s de cerca. El filtro bayesiano contiene una herramienta, accesible a trav\u00e9s de la l\u00ednea de comandos sa-learn, que puede utilizarse para buscar heur\u00edstica en correos electr\u00f3nicos individuales o en buzones completos. Si este proceso se ha realizado unas cuantas veces, el n\u00famero de falsos positivos se reduce significativamente.<\/p>\n<h2>Desarrollo actual<\/h2>\n<p>En el curso de las \u00faltimas actualizaciones de las versiones 3.3 y 3.4, SpamAssassin ha recibido una nueva e importante caracter\u00edstica que deber\u00eda tener un gran impacto en el uso de los recursos. Aunque se han hecho optimizaciones de rendimiento por adelantado, el programa ahora se comporta como un aut\u00f3mata finito determinista. B\u00e1sicamente, el hardware puede adaptarse mejor a las DEA porque los posibles estados siempre se ejecutan de forma determinista, es decir, predeterminados. Un sistema programado apropiadamente - como el hardware de los servidores de hoy en d\u00eda - puede as\u00ed reservar y liberar recursos de manera cr\u00edtica en el tiempo.<\/p>\n<h2>Apoyo a los programas<\/h2>\n<p>Como ya se ha mencionado, la alta flexibilidad del c\u00f3digo del programa es un punto de venta \u00fanico, pero SpamAssassin tambi\u00e9n tiene una exitosa API que permite el intercambio de datos con muchos otros programas. Entre los proyectos de c\u00f3digo abierto se encuentran los clientes de correo electr\u00f3nico frecuentemente utilizados Mozilla Thunderbird, KMail as\u00ed como Novell Evolution o ex\u00f3ticos como Citadel o Claws Mail. Con los productos comerciales SpamAssassin ya est\u00e1 integrado en el c\u00f3digo del programa. Este es el caso del servidor Icewarp, McAfee SpamKiller, Mac OS X Server o Sophos PureMessage.<\/p>","protected":false},"excerpt":{"rendered":"<p>Pro Tag werden 28 Milliarden SPAM-Mails versendet. Das ist ein Gro\u00dfteil des gesamten E-Mail-Verkehrs und kaum ein E-Mail-Konto bleibt von den unerw\u00fcnschten Werbemails verschont. Die bisher einzige M\u00f6glichkeit, sein Postfach vor ihnen zu sch\u00fctzen, ist ein guter und funktionierender Spam-Filter. Auch SpamAssassin ist ein solcher Spam-Filter, jedoch macht ihn vor allem sein buchst\u00e4blich handverlesener Algorithmus 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