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--- tutoriaux:install-email-server:install-email-server-part-8 [2023/01/06 18:08] – créée - modification externe 127.0.0.1
+++ tutoriaux:install-email-server:install-email-server-part-8 [2024/07/06 01:17] (Version actuelle) – frater
@@ Ligne 1: / Ligne 1: @@
-====== Build Email Server From Scratch on Debian – Part 8 - Setting Up Amavis and ClamAV ======
+====== Part 8 - Setting Up Amavis and ClamAV ======
 In this article, I will show you how to use **Amavis** and **ClamAV** to scan viruses in email messages.
@@ Ligne 415: / Ligne 415: @@
 Press Ctrl+C to stop amavisd-nanny.
+===== PostGrey : Postfix Greylisting Policy Server  =====
+When a request for delivery of a mail is received by Postfix via SMTP, the triplet CLIENT_IP / SENDER / RECIPIENT is built. If it is the first time that this triplet is seen, or if the triplet was first seen, less than 5 minutes ago, then the mail gets rejected with a temporary error. Hopefully spammers or viruses will not try again later, as it is however required per RFC.
+==== Installation ====
+<code bash>sudo apt install postgrey</code>
+the package is self installing, you have noting to change to the postfix's configuration files.
+==== Configuration ====
+''postgrey'' is, out-of-the-box working (by replying to unknown sender to retry sending later (usually 5 minutes).
+You may want to "whitelist" sender or destination email (by white listing you're **NOT** applying any delay or retry policies).
+Edit the two files in ''/etc/postgey/'' directory
+    * ''whitelist_clients'' is for whitelisting the sender's hostname
+    * ''whitelist_reciepients'' is for not applying **ANY** delay nor retry to specific destination (internal) email.
+==== examples ====
+<code sshconfig whitelist_recipients>
+# postgrey whitelist for mail recipients
+# --------------------------------------
+# put this file in /etc/postgrey or specify its path with --whitelist-recipients=xxx
+# do not delay mail to :
+postmaster@
+abuse@
+</code>
+<code sshconfig whitelist_clients>
+# postgrey whitelist for mail client hostnames
+# --------------------------------------------
+# put this file in /etc/postgrey or specify its path with --whitelist-clients=xxx
+#
+# postgrey version: 1.36, build date: 2015-09-01
+# Debian-specific additions
+# I *know* they run real mail queues, so greylisting only creates bigger load for them.
+debconf.org
+debian.org
+spi-inc.org
+# you may also add IPs
+.1.1.1
+# or regex expressions:
+/^mail\d+\.telekom\.de$/
+</code>
 ===== Skip Virus-Checking for Your Newsletters =====

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