The Good NetKeeping Seal of Approval or GNKSA is a designation that indicates a piece of Usenet newsreader (client) software meets a set of usability and formatting standards. The name is a play on the "Good Housekeeping Seal of Approval", a set of consumer reports issued by Good Housekeeping Magazine.
The original GNKSA author thought that many newbies to Usenet posted malformed or inappropriately-sent articles because their software did not encourage better netiquette. For instance, software which made it easy to confuse replying to a sender by email with posting a followup to a newsgroup led to users mistakenly publishing what was intended to be a private response, or vice versa.
Some of the guidelines from GNKSA 2.0
Additional requirements concern accurate From: headers, signature block formatting, and the ability to cancel and supersede articles.