I received a question from my client about how to add an external email warning message in Zimbra when receiving
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Zimbra Tips : How To Block Email From and Return-Path did not Match
Recently, my client got spam e-mail originating from their domain. Although, I have improved by implementing the sasl / sender
Continue readingZimbra Tips : How To Restrict SASL Login/Access
Zimbra have functions to enable access to IMAP/POP on all users. Admin can perform check/uncheck to enable/disable that function on
Continue readingZimbra Tips : How To Disable Disclaimer When Reply and Forward Email
When you configure disclaimer on Zimbra, disclaimer will display on every email that you sent, reply or forward. Yes, you can
Continue readingZimbra Tips : How To Display Zimbra Account More Than 5000 Users
By default, Zimbra have limitation to display account on Zimbra Admin up to 5000 users. I have some clients who have
Continue readingZimbra Tips : How To Enforce SPF Checking For Incoming Email
Before configure this guidance, please make sure you’ve configured SPF checking from this link : https://imanudin.net/2016/03/11/zimbra-tips-how-to-enable-spf-checking-for-incoming-connection/. When you’ve done, by default
Continue readingZimbra Tips : How To Enable PTR/Reverse DNS Lookup for Incoming Email
Most of spam email sent from public IP who did not have PTR/Reverse DNS. What is PTR/Reverse DNS, you can
Continue readingZimbra Tips : How To Enable DKIM/DomainKeys Checking/Verify for Incoming Email
From previous article, you can configure and validate DKIM records on Zimbra which is used to increase email reputation. The configuration will increase
Continue readingEmail Server Tips : How To Check SMTP Outgoing Already Use Encryption/TLS Connection
Many ways to secure email delivery. One of them is use TLS connection/encrypted when sending email. The encryption connection will make connection
Continue readingTips Bypass Relay Email on Zimbra Mail Server
I have condition in my clients where all outgoing email from their server do relay into Relay server. This caused usually Public
Continue readingZimbra Tips : How To Download Email in Junk Folder
When using email client and using pop/pop3 protocol for retrieve email, just email in inbox folder to be downloaded. Sometimes,
Continue readingZimbra Tips : Blacklist Email Based on Subject
Recently, i am often receive email with subject “me new photo” which is contains spam and fake link. i am
Continue readingZimbra Tips : How To Reset To COS Value (Class Of Service)
After set COS for all users as described on previous article, overall the value/features on COS has been rewrite for all users. However,
Continue readingMailman Tips : How To Migrate Mailman Mailing List
I have plan to migrate my old email server Zimbra integration with Mailman from single to multi server. I have been
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