Utilities: Administration: Server: Server Settings: DNS Bypass

ListManager features an integrated DNS engine, so you do not need to set up, configure, or maintain a separate DNS server. Instead of using a separate process or DNS server to resolve hostnames, ListManager will use its own DNS resolver.

By default, you will see the root name servers used by ListManager for DNS resolution on this page. If you remove these servers, ListManager will not work properly.

DNS Bypass allows you to specify that ListManager use a particular TCP/IP address for a domain. If you are running ListManager behind a firewall or in a DMZ, you may need it to use a particular TCP/IP address to route internal mail for your domain. Otherwise, ListManager will use the external DNS information for sending mail to your domain, which can cause problems with some firewalls. Instead of delivering to the internal IP address, ListManager will use the external DNS information for your domain, requiring the mail to go out through the firewall and then back in again. Some firewalls will refuse this kind of traffic, so you will need to use DNS Bypass to have ListManager route mail correctly inside your firewall.

If you must create a DNS Bypass and you have multiple hostnames for a single domain, you will either need to create a DNS Bypass for each hostname and IP address, or designate that ListManager use a particular name server for a domain.

For example, let's say you have the domain example.com, which has two mail servers: mx1.example.com, and mx2.example.com. You also have an internal DNS server for example.com, ns.example.com. You can either create 2 mx DNS bypasses, one instructing ListManager to use mx1.example.com and one telling it to use mx2.example.com for the example.com domain. Or, you could create an NS DNS bypass that instructs ListManager to use ns.example.com for all DNS lookups for example.com. Note that in this example ns.example.com MUST have entries for example.com.

The hostname for each IP address must be unique; for example, you should not have both mx1.example.com and mx2.example.com point to the same IP address.

Finding a DNS Bypass

Twenty DNS bypasses are shown at a time. You may change the sorting order of the bypasses by clicking the up or down triangles. By clicking the top triangle, the sort order will be ascending (a-z); clicking the bottom arrow makes the sort order descending (z-a). Click Next to see the next twenty DNS Bypass entries, Previous to see the last twenty.

Domain

The domain for this DNS bypass entry, e.g. example.com.

Hostname

The hostname for this DNS bypass entry, e.g. mx1.example.com.

Type

The type of DNS entry: NS or MX.

Address

The TCP/IP address for this domain.

Viewing or Editing a DNS Bypass

To view a DNS bypass, click on the DNS bypass entry's domain. You will be taken to the Utilities: Administration: Server: Server Settings: DNS Bypass Edit page, where you can view or edit the DNS bypass.

Deleting a DNS Bypass

Click Delete next to the DNS bypass you'd like to delete. ListManager will ask you if you're sure before deleting the DNS bypass. You must restart ListManager for this change to take effect.

Creating A DNS Bypass

Click create new DNS bypass to be taken to the Utilities: Administration: Server: Server Settings: New DNS Bypass page. Or, select Copy next to a DNS bypass entry you'd like to copy.

Download as a File

Click on the disk icon to download your list of DNS bypasses in CSV format.