Under the hood
Internal 'is this a human sender' check now matches any sender kind starting with 'hearth'
What
An internal helper that decides whether a message sender counts as human previously matched only two exact sender-kind values. It now also treats any sender kind beginning with the prefix hearth as human.
Why
This broadens which sender types are recognized as human rather than automated, though the finding doesn't say what hearth-prefixed senders are.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
What the 'hearth' prefix refers to or where such sender kinds come from is not stated.