What are common CNAME misconfigurations?

Frequent CNAME mistakes:

Wrong target: Typo in ESP's tracking hostname. Links fail completely.

Missing verification: DNS added but never verified in ESP portal. SSL not provisioned.

Conflicting records: CNAME cannot coexist with A records at same name. One must be removed.

Trailing dot issues: Some providers need trailing dot, some do not. Causes resolution failures.

Subdomain choice: Using a subdomain already in use for other purposes creates conflicts.

Propagation impatience: Testing before DNS propagates, assuming failure when it is just timing.

Always verify with external tools after setup.

Common filing errors in the registry. Small mistakes cause big processing failures.