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05Nov, 2019

ZIMBRA: Enable plain text authentication

  This post explains how to enable plain text authentication in Zimbra mail server, it also explains the necessary changes that needs to be made on the proxy service 1. Enable plain…

01Nov, 2019

Zimbra: Configure Sender Address Verification

  In Zimbra mail initially mail lands in the proxy SMTP port and then is sent to the actual SMTP server and only after that the recipient verification is triggered. Below…

10Oct, 2018

Enabling Brutforce Notifications on Zimbra Mail Server

Like any other mail server’s Zimbra too is prone to SMTP brutforce attacks. Hackers around the world try to login to the SMTP servers with the most commonly used email…

23Mar, 2018

Clear Exim Mail Queue

  Spamming is one of the things we often face as administrators in the day to day work, if you are using Exim mail server, below commands will help you to…

30Apr, 2016

Installing Zimbra 8.6 on CentOS 7

1. Setup hostname 2. Add entry in hosts file 3. Install dependencies yum install nmap-ncat perl perl-core sysstat 4. Download Zimbra installation file for CentOS 7 wget https://files.zimbra.com/downloads/8.6.0_GA/zcs-8.6.0_GA_1153.RHEL7_64.20141215151110.tgz 5. Uncompress the file tar -xvf https://files.zimbra.com/downloads/8.6.0_GA/zcs-8.6.0_GA_1153.RHEL7_64.20141215151110.tgz 6. Enter the…

07Apr, 2016

Exim:Important Exim Mail Server commands

1. To check the number of emails present in the queue: exim -bpc 2. To check the emails present in the queue with the mail id and sender ID: exim -bp exim -bp |…

08Mar, 2016

Zimbra: Assign a dedicated Outgoing SMTP IP for a domain

Zimbra Outgoing SMTP IP per Domain   1. Add the following line in “/opt/zimbra/postfix/conf/main.cf”   sender_dependent_default_transport_maps = regexp:/opt/zimbra/postfix/conf/sdd_transport_maps.regexp   2. Create the file “/opt/zimbra/postfix/conf/sdd_transport_maps.regexp” and add the domains as below   /@example\.com$/ …

07Mar, 2016

BASH: Script to alert when Exim mail queue is HIGH

  The following script sends an alert whenever the exim mail queue is greater than a certain threshold   #!/bin/bash if [ `/usr/sbin/exim -bpc` -ge 300 ]; then mail -s “Alert: There are over 300…

01Mar, 2016

Script to Test Email Mail Delivery using SMTP Authentication

  The below script may be useful to test the mail delivery using email authentication with and without SSL Note: The script uses pear Mail function, so make sure that PEAR Mail

25Feb, 2016

Online System/Network Admin Tools

  1. MXTOOLBOX: One of the most popular website to check MX Records, Blacklist Status, SPF, DKIM, DNS, OPEN Ports etc … website: http://www.mxtoolbox.com 2. WHATISMYDNS: Want to check the global propogation status of your…

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