Asn Zimbra <iPad>

You will see something like: origin: AS15169 (Google’s ASN). Zimbra does not have a GUI for ASN filtering, but you can configure Postfix directly.

postmap /opt/zimbra/common/conf/postfix_asn_blacklist asn zimbra

# Example: Block a spammy ASN range 192.0.2.0/24 REJECT Spam from ASN 12345 203.0.113.0/24 REJECT Spam from ASN 67890 You will see something like: origin: AS15169 (Google’s

Edit /opt/zimbra/common/conf/postfix_asn_blacklist Add the ASN netblocks (you must expand ASN to CIDR ranges manually or via script): In the world of email server management, particularly

Since "ASN" can refer to several technical concepts (Autonomous System Number, Application Service Node, or an education provider like ASN), this article covers the most common and technically relevant scenarios for IT administrators and engineers. In the world of email server management, particularly for administrators handling Zimbra Collaboration Suite (ZCS) , logs and headers often present cryptic acronyms. One such term that frequently appears in mail logs, firewall rules, or anti-spam configurations is ASN .