How can DNS host limitations break authentication?
DNS provider limitations affecting email:
TXT record length: Some providers truncate long records. Breaks DKIM keys or complex SPF.
TXT string splitting: Improper handling of multi-string records corrupts data.
Record count limits: Restrictions on total records or records per name.
Character restrictions: Some providers reject special characters or require escaping.
Propagation delays: Slow updates cause extended authentication failures during changes.
No API access: Cannot automate DKIM key rotation or SPF updates.
Before committing to a DNS provider, test that they properly handle 2048-bit DKIM keys and complex SPF records.
Some registry offices cannot process certain document formats. Verify capabilities before filing.
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