Category: Postfix

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$/ example_com:   3. Once done edit “/opt/zimbra/postfix/conf/master.cf.in” and add the below code   example_com unix – – n – – smtp -o smtp_bind_address=<dedicated […]

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 DNS records ? WHATISMYDNS is the right online tool website: http://www.whatismydns.net 3. HOST-TRACKER: Want to know whether your website is […]

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 iptables6 service   chkconfig ip6tables –level 345 off   […]

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