Smtp et filtrage
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Transcript of Smtp et filtrage
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SMTP et filtrageQuelques bonnes pratiques
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Le protocole SMTP
• Protocole asynchrone
• Peu de sécurité
• Best effort
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ZCS et SMTP
• Zimbra-MTA
• Autonome
• Extensible
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SMTP « out »
• Direct ou via relai ?
• Filtrage sortant
• Gestion des files d’attente
• Signature (SPF - DKIM)
• Backscatter (BTAV - VERP)
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SMTP « in »
• Direct ou via relai ?
• Relai MTA ou appliance ?
• Filtrage AntiVirus et AntiSpam
• Test de Turing
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Relai « in »
• Subnets - opérateurs - hébergeurs
• Sizing
• AntiVirus
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AntiSpam
• RBL au niveau SMTP
• GreyListing
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AntiSpam
• Bogofilter
• SaneSecurity (Phishing & Scam)
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SpamAssassin
• dcc - pyzor - razor - iXhash
• RBL et URIBL
• Filtre bayesien
• Rules of the day & co
• SPF - DKIM
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Intégration
• Appliances
• SA sur Zimbra MTA
• Apprentissage