In this  tutorial, How to configure whitelist and blacklist domain in zimbra . To use amavisd.conf.in file before it's configure, To backup file /opt/zimbra/conf/amavisd.conf.in we need to score Positive is Blacklist and Negative score is whitelist. I'm running the commands with account zimbra ( su - zimbra) Links to below you maybe likes: zimbra custom spamassassin rules How to create auto Bcc for Recipient mails for Zimbra 8.6 How to add spam filters on zimbra 8.6 How to create auto Bcc for sender mails for Zimbra 8.6 list accounts that has not logged in for the last x days in zimbra Whitelist and Blacklist domain in zimbra 8.6 To backup amavisd.conf.in file su - zimbra cp /opt/zimbra/conf/amavisd.conf.in /opt/zimbra/conf/amavisd.conf.in.bak How to whitelist domain in zimbra To add whitelist domain or emailID  in amavisd.conf.in file vim /opt/zimbra/conf/amavisd.conf.in The content whitelist domain as below: { # a hash-type lookup table (associative array) ...

Introduction Learn how to create a reverse DNS lookup script in Bash from basic to advanced levels. This detailed guide includes examples, explanations, and common FAQs to help you master DNS lookups. Includes a complete script for practical use. Reverse DNS lookup is a process used to determine the domain name associated with an IP address. This is particularly useful in network troubleshooting and server management. In this guide, we'll walk through creating a reverse DNS lookup script in Bash , starting from basic concepts and advancing to more complex implementations. By the end of this article, you'll be able to create a robust script to perform reverse DNS lookups efficiently. What is Reverse DNS Lookup? Understanding DNS DNS (Domain Name System) is like the phonebook of the internet, translating human-friendly domain names to IP addresses. Reverse DNS lookup works in the opposite direction, mapping IP addresses back to domain names. Importance of Reverse DNS Lookup Rever...

How to prevent spam on zimbra. To use zimbra spamassassin filter. To backlist and whitelist all email from address or domain. To spam-check mail incoming email to system your email or To spam-check internal mail. To use zimbra 8.6 and later, The commands as below running on zimbra MTA.  Links to below you maybe likes: zimbra custom spamassassin rules How to create auto Bcc for Recipient mails for Zimbra 8.6 How to add spam filters on zimbra 8.6 How to create auto Bcc for sender mails for Zimbra 8.6 list accounts that has not logged in for the last x days in zimbra zimbra custom spamassassin rules Enabling SpamAssassin rule updates su - zimbra zmlocalconfig -e antispam_enable_rule_updates=true zmlocalconfig -e antispam_enable_restarts=true zmlocalconfig -e antispam_enable_rule_compilation=true zmamavisdctl restart zmmtactl restart To check and configure zimbra Spam Subject Tag, zimbra Spam Tag Percent, zimbra Spam Kill Percent attribute. zmprov gcf zimbraSpamSubjectT...

How to block backscatter email on zimbra. How many reasons why bounces from spam email. To run commands as below su - zimbra zmprov mcf zimbraMtaEnableSmtpdPolicyd TRUE zmprov mcf zimbraMtaSmtpdRejectUnlistedRecipient yes zmprov mcf zimbraMtaSmtpdRejectUnlistedSender yes zmprov mcf +zimbraMtaRestriction "check_policy_service unix:private/policy" zmmtactl restart zmconfigdctl restart The solve problem Bounces backscatter from spam email