{"id":4209,"date":"2020-10-30T20:09:44","date_gmt":"2020-10-30T19:09:44","guid":{"rendered":"https:\/\/webhosting.de\/amavis-die-schnittstelle-zwischen-mailserver-und-spam-virusschutz\/"},"modified":"2020-10-30T20:09:44","modified_gmt":"2020-10-30T19:09:44","slug":"amavis-the-interface-between-mailserver-and-spam-virus-protection","status":"publish","type":"post","link":"https:\/\/webhosting.de\/sv\/amavis-die-schnittstelle-zwischen-mailserver-und-spam-virusschutz\/","title":{"rendered":"amavis - Gr\u00e4nssnittet mellan e-postserver och skr\u00e4ppost\/virusskydd"},"content":{"rendered":"<p>Amavis \u00e4r en virusscanner p\u00e5 serversidan som \u00e4r skriven i programmeringsspr\u00e5ket Perl och anv\u00e4nds p\u00e5 Unix mailservrar. Om ett o\u00f6nskat <a href=\"https:\/\/webhosting.de\/sv\/e-mail-von-webhosting-account-trennen\/\">E-post<\/a> Amavis tar automatiskt bort dem fr\u00e5n cirkulation. P\u00e5 senare tid har det p\u00e5litliga programmet ocks\u00e5 anv\u00e4nts f\u00f6r att blockera skr\u00e4ppostmeddelanden som annars skulle blockera e-postservern. Detta anv\u00e4ndbara verktyg sparar mycket tid och inst\u00e4llningsm\u00f6jligheterna ger gott om utrymme f\u00f6r att anpassa konfigurationen av e-postservern.<\/p>\n<h3>SpamAssassin eliminerar virus p\u00e5 ett tillf\u00f6rlitligt s\u00e4tt<\/h3>\n<p>En viktig del av Amavis \u00e4r modulen SpamAssassin. Oavsett hur m\u00e5nga mottagare som anges kontrollerar den h\u00e4r skr\u00e4ppostblockeraren om meddelandet passar in i den f\u00f6rinst\u00e4llda skr\u00e4ppostkategorin eller inte. P\u00e5 s\u00e5 s\u00e4tt blir e-postservern inte \u00f6verbelastad med denna uppgift och alla inkommande meddelanden behandlas ist\u00e4llet effektivt centralt i enlighet med den enskilda mottagarens \u00f6nskem\u00e5l. I allm\u00e4nhet \u00e4r kombinationen av skr\u00e4ppostblockerare och virusskanner mycket resurssn\u00e5l. Amavis skrevs i programmeringsspr\u00e5ket Perl, med s\u00e4rskilt fokus p\u00e5 att f\u00f6rhindra buffert\u00f6verfl\u00f6den samtidigt som administrat\u00f6rer f\u00e5r enkla underh\u00e5llsalternativ. Amavis ser sig inte i f\u00f6rsta hand som en virusscanner, utan mer som ett gr\u00e4nssnitt som kan ut\u00f6kas med antivirusprogram som SpamAssassin, ClamAV, Kaspersky LMS eller AVG AV. Inom denna ram kan hot mot e-postservern och arbetsdatorerna uppt\u00e4ckas och f\u00f6rhindras p\u00e5 kort tid. Amavis kan arkivera eller s\u00e4tta meddelanden i karant\u00e4n. Dessa kan lagras antingen i en brevl\u00e5da eller i en SQL <a href=\"https:\/\/webhosting.de\/sv\/datenbank-server\/\">Databas<\/a> kan \u00f6verf\u00f6ras. Det \u00e4r ocks\u00e5 m\u00f6jligt att skapa en DKIM-signatur med Amavis. Detta identifieringsprotokoll s\u00e4kerst\u00e4ller att e-postmeddelandet \u00e4r autentiserat. P\u00e5 s\u00e5 s\u00e4tt f\u00f6rhindras falska e-postmeddelanden, vilket alltid orsakar allvarliga s\u00e4kerhetsproblem. Amavis st\u00f6der en rad olika MTA-inst\u00e4llningar. I allm\u00e4nhet har serveradministrat\u00f6ren m\u00e5nga inst\u00e4llningar till sitt f\u00f6rfogande och kan tilldela e-postmottagare till enskilda undergrupper, som i sin tur arbetar enligt sina egna regler. Det \u00e4r till exempel m\u00f6jligt att ta emot skr\u00e4ppostmeddelanden med en egen rubrik som \u00e4r skr\u00e4ddarsydd f\u00f6r respektive mottagare.<\/p>\n<h3>Amavis \u00f6vertygar med god prestanda<\/h3>\n<p>\u00c4ven om Amavis \u00e4r skrivet i programmeringsspr\u00e5ket Perl kan programmet \u00e4nd\u00e5 \u00f6vertyga med god prestanda. Detta beror fr\u00e4mst p\u00e5 att stora block av data inte skannas rad f\u00f6r rad, on\u00f6dig kopiering av filer har f\u00f6rhindrats och utvecklarna har visat ett gott sinne f\u00f6r optimering. I kombination med de ovann\u00e4mnda antivirusprogrammen b\u00f6r man \u00e4nd\u00e5 vara uppm\u00e4rksam p\u00e5 vilka e-postmeddelanden som b\u00f6r granskas n\u00e4rmare. S\u00e4rskilt om den n\u00f6dv\u00e4ndiga identifieraren finns tillg\u00e4nglig kan undantag definieras f\u00f6r att m\u00f6jligg\u00f6ra snabb och snabb behandling. Amavis \u00e4r i f\u00f6rsta hand engagerad i de definierade RFC-standarderna. En del av projektets b\u00f6rjan g\u00e5r tillbaka till 1997. Inkommande meddelanden vidarebefordras till Mail Transfer Agent med hj\u00e4lp av de v\u00e4lk\u00e4nda SMTP- och LMTP-protokollen. Om en ov\u00e4ntad h\u00e4ndelse intr\u00e4ffar under post\u00f6verf\u00f6ringen, tr\u00e4der en rad \u00e5tg\u00e4rder omedelbart i kraft f\u00f6r att s\u00e4kra meddelandet. Med denna upps\u00e4ttning \u00e5tg\u00e4rder f\u00f6rhindrar Amavis att post g\u00e5r f\u00f6rlorad eller att meddelanden blir ol\u00e4sbara p\u00e5 grund av en krasch. Meddelanden lagras inte i minnet, vilket b\u00f6r f\u00f6rhindra att alltf\u00f6r stora meddelanden orsakar krasch eller allvarliga serverproblem. Det enda undantaget \u00e4r \u00f6verf\u00f6ringen till virusskannern SpamAssassin, men det beror p\u00e5 hur skannern fungerar. Detta kan f\u00f6rhindras genom att anv\u00e4nda <a href=\"https:\/\/webhosting.de\/sv\/administrator\/\">Administrat\u00f6r<\/a> anger en storleksgr\u00e4ns f\u00f6r filer s\u00e5 att meddelanden \u00f6ver en viss storlek inte vidarebefordras till modulen utan m\u00e5ste genomg\u00e5 en separat kontroll i st\u00e4llet. Precis som i andra gr\u00e4nssnitt f\u00f6r e-postservrar kan vissa avs\u00e4ndare l\u00e4ggas in i en svartlista eller vitlista. Detta sparar mycket arbete \u00e5t e-postservern och g\u00f6r att du kan sortera bort avs\u00e4ndare som tidigare har orsakat problem eller f\u00f6r vilka en kontroll inte \u00e4r n\u00f6dv\u00e4ndig. P\u00e5 det hela taget \u00e4r Amavis ett \u00f6vertygande programpaket som l\u00e4tt kan ut\u00f6kas med ytterligare moduler eller virusskannrar och som visar sig vara ett anv\u00e4ndbart gr\u00e4nssnitt.<\/p>","protected":false},"excerpt":{"rendered":"<p>Bei Amavis handelt es sich um einen serverseitigen Virenscanner, der in der Programmiersprache Perl geschrieben wurde und auf Unix-Mailservern zum Einsatz kommt. Wird eine unerw\u00fcnschte E-Mail entdeckt, zieht Amavis diese automatisch aus dem Verkehr. Neuerdings werden mit der zuverl\u00e4ssigen Programm auch Spam-Nachrichten blockiert, die ansonsten den Mailserver zum\u00fcllen w\u00fcrden. Mit dem n\u00fctzlichen Tool l\u00e4sst sich 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