Zimbra: Enable Plain Text (Clear Text) Authentication for IMAP and POP3
By default, Zimbra requires encrypted connections (TLS/SSL) for IMAP and POP3 authentication. Some legacy mail clients or scripts that ...
Zimbra: Enable Sender and Recipient Address Verification at SMTP Time
By default, Zimbra accepts inbound messages destined for non-existent accounts and only rejects them after the full message body ...
Enable Zimbra Brute-Force Login Notifications with zmauditswatch
Zimbra includes a built-in audit-watching service called zmauditswatch that monitors the Zimbra audit log for repeated authentication failures and ...
How to Clear the Exim Mail Queue (Spam, Frozen, and Bulk Delete)
When your Exim mail queue fills up with spam or bounced messages, server performance degrades and legitimate emails may ...
Installing Zimbra Mail Server on CentOS 7 / AlmaLinux
This guide covers installing Zimbra Collaboration Server on CentOS 7 / RHEL 7. Note: Zimbra 8.6 is EOL. The ...
Essential Exim Mail Server Commands: The Complete Admin Reference
Exim is the default Mail Transfer Agent (MTA) on cPanel servers and many other Linux hosting environments. This reference ...
Zimbra: How to Assign a Dedicated Outgoing SMTP IP per Domain
Running multiple domains on a single Zimbra mail server? You may need each domain to send outgoing email through ...
Bash Script to Alert When Exim Mail Queue Is Too High
A sudden spike in the Exim mail queue is one of the clearest early warning signs of a spam ...
PHP Scripts to Test SMTP Email Delivery with Authentication
When diagnosing email delivery problems on a Linux server, you need a reliable way to test SMTP authentication and ...
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