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A TTL of 1800 to 3600 is recommended for TXT (SPF)/DMARC/DKIM/CAA records. If you don't need to make changes often, opt for the higher TTL, which will be sufficient since these records are primarily used for static verifications.

The DNS 'text' (TXT) record lets a domain administrator enter text into the Domain Name System (DNS). The TXT record was originally intended as a place for human-readable notes. However, now it is also possible to put some machine-readable data into TXT records. One domain can have many TXT records.

There are no specific formatting requirements for basic TXT records, but there are some restrictions. These records aren't meant for large bytes of data. If the text value is longer than 255 characters, you'll need to split the value into separate parts.

Add a TXT record Sign in to your domain's account at your domain host. Locate the page for updating your domain's DNS records. ... Locate the TXT records for your domain on this page. Add a TXT record for the domain and for each subdomain (view "Use Cases" below).

Update an existing TXT record Sign in to your Domain Control Panel. Scroll down to the TXT Records section then click the Edit icon. In the Update TXT Record dialog, enter a new Hostname and/or Text value then click the Update button. You'll be returned to the TXT Records page with your updated record shown.

TXT records are a type of Domain Name System (DNS) record in text format, which contain information about your domain. TXT records also have information that helps external network servers and services handle outgoing email from your domain.

Most TXT records can have up to 255 characters. For TXT records that include more than 255 characters, DNS adds multiple strings together in a single record. If you're using a 2048-bit DKIM key, you can't enter it as a single text string in a DNS record with a 255-character limit.