SPF Record type 99 was deprecated in April 2014 per RFC7208. It is now best practice to configure framework policies in a TXT record, which shares the same format type as an SPF record. RFC studies have found that using SPF records can lead to interoperability issues.
In accordance with RFCs, DNS Made Easy no longer allows the use of SPF records for newly added domains or in new configurations.
Note: DNS Made Easy still supports modifications and deletions of SPF records that currently exist in your account.
Here is our documentation for creating TXT Records.