What are DKIM (Domain Keys Identified Mail) Records?

Domain Keys Identified Mail (DKIM) records allow a recipient to validate a sender as the owner of an email message. Domain Keys use public key encryption to apply digital signatures to email, this allows verification of the sender as well as of the integrity of the message in question. DK/DKIM records are generated by your email service provider and created as TXT Records within Constellix. Visit the Domain Key public website to learn more.

DKIM Record Fields

Field Description

A) Name This will be the hostname for the record, typically a computer or server within your domain. It is important to note, the domain name is automatically appended to the “Name” field of the record. For example, defining www.example.com in DNS would be creating an A record with the name field of “www” within the example.com domain. If the “Name” field is left blank, it represents the root record of the domain. The root record for the base domain can also be referred to as the apex record and is represented in a @ symbol in some documentation. Typically DKIM records would have a blank name field.

B) TTL The TTL (Time to Live) in seconds is the length of time the record will cache in resolving name servers and web browsers. The longer the TTL, then remote systems will lookup the DNS record less frequently. Your nameservers will also receive less query traffic since most queries are answered by resolving name servers. Conversely, the shorter the TTL the faster any changes you make to your DNS will propagate in servers that have cached data. However, your domain will receive more query traffic.

Recommended values:

Records that are static and don’t change often should have TTL’s set between 1800 (being on the low end) to 86400 seconds (30 minutes to 1 day cache).

Records configured with Failover or that change often should have TTL’s set anywhere from 180 to 600 (3 to 10 minutes cache).

If a change is needed for a record with a high TTL, then the TTL can be lowered prior to making the change and then raised back up again after the changes were made.

C) Value The DKIM string for your domain.

D) Notes Add a helpful note with keywords so you can search for your records later.

E) Save Save your record changes and don’t forget to commit your changes after you’re done making record changes for this domain!

txt record

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