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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…

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…

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$/ …

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…

03Feb, 2016

Disable IPV6 on CentOS 6.x servers

  1. Edit /etc/sysctl.conf  and add the following line   net.ipv6.conf.all.disable_ipv6 = 1   2. Edit /etc/sysconfig/network and add the following line   NETWORKING_IPV6=no   3. Edit /etc/sysconfig/network-scripts/ifcfg-eth0 and add the following line   IPV6INIT=no   4. Stop iptables6 service   service iptables6 stop   5. Disable…

02Feb, 2016

Run Zimbra on Both HTTP and HTTPS

  1. Disable ProxySSLUpstream   zmprov ms `zmhostname` zimbraReverseProxySSLToUpstreamEnabled FALSE   2. Reconfigure Nginx   /opt/zimbra/libexec/zmproxyconfig -e -w -o -a 8080:80:8443:443 -x both -H `zmhostname`   3. Configure Zimbra to run both on HTTPS and HTTP   zmtlsctl both zmprov ms `zmhostname`…

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