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How To Configure Zimbra rDNS?

The rDNS or reverse DNS resolves the domain name associated with an IP as opposed to DNS which resolves the IP associated with a domain name. This can be used...
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How To Configure Zimbra DMARC?

DMARC or Domain-based Message Authentication, Reporting, and Conformance is an email authentication, policy, and reporting protocol that defines how your email servers should manage your SPF and DKIM. DMARC protects your domain...
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How To Configure Zimbra SPF to Check Incoming Emails?

SPF or Sender Policy Framework is an email authentication method that identifies which mail servers are allowed to send emails on behalf of your domain. I can forge an email header to...
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How To Configure Zimbra SPF for Outgoing Emails?

SPF or Sender Policy Framework is an email authentication method that identifies which mail servers are allowed to send emails on behalf of your domain. I can forge an email header to...
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How To Configure Zimbra DKIM to Check Incoming Emails?

DKIM or DomainKeys Identified Mail is an email authentication method that tries to identify email spoofing attempts (creation of email messages with a forged sender address). DKIM enables you as the receiver of the email to verify...
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How To Configure Zimbra DKIM to Sign Outgoing Emails?

DKIM or DomainKeys Identified Mail is an email authentication method that tries to identify email spoofing attempts (creation of email messages with a forged sender address). DKIM enables you as the receiver of the email to verify...
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Email Protection Routines

After installing Zimbra Collaboration Suite, there are some configurations you may want to set up in order to improve the security of sending emails to other email systems. Phishing and...
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DNS Server Installation Guide on CentOS 7 / RHEL 7 and CentOS 8 / RHEL 8 using dnsmasq

This article will show you how to install and configure a DNS server using dnsmasq on CentOS / RHEL. This will be a step by step walkthrough, very useful in...
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