Why did verification return unknown?

Unknown means the system could not establish enough certainty at the time of the check.

Why this happens

Typical reasons include:

• temporary provider behavior
• greylisting
• inconclusive server responses
• conditions that need a retry instead of a forced answer

What to do

• avoid treating unknown as valid
• retry later if timing matters
• review whether the address source is high quality

For the deeper explanation, read Results and Statuses.

If unknown results persist unusually long, open the support widget with the job ID or domain examples.