Expertise level: Easy
A reverse DNS (configured as a PTR record) is the association of a domain name with a given IP address. The standards of reverse DNS/PTR mechanism are described in the following RFCs: RFC1033 and RFC1912 Section 2.1
The best practices for servers is to have a PTR associate with each IP addresse used to send emails. The domain provided in the reverse DNS belongs to the responsible parties and usually have a web site set up with the appropriate contact information for the domain.
**The domain provided in the reverse DNS needs to be a valid A record (domain or sub-domain) that resolve to the server IP address.**
If your server has more than one IP address, please ensure that all IP addresses have a corresponding PTR record (not just the first one). It is also recommended to set up that domain for your SMTP service banner, to keep consistency.
Example of a reverse DNS configuration:
mail1.client_domain.com or server1.client_domain.com
How to verify the PTR record of your iWeb server IP:
You can use the command "host". For example if you IP is ww.xx.yy.zz:
# host ww.xx.yy.zz
zz.yy.xx.ww.in-addr.arpa domain name pointer
You can also use online tools such as:
How to change/configure your iWeb Servers IP addresses PTR records:
Control Center (scroll down for Customer Hub)
1) Start by logging into your Control Center and select the Smart Server you wish to configure:
2) Select the Network tab.
3) Next, select the menu item labeled "Manage PTR Records (Reverse DNS)".
4) Finally, select the IP address associated with your account, and enter the domain you wish to assign. Note that each IP address and domain combination must be unique. One domain has one IP address, and one IP address has one domain.
5) Once you have entered your domain, click "Save" to complete the operation. Please allow up to 12 hours for the propagation of DNS records.