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…
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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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