How does M3AAWG define acceptable complaint behavior?

M3AAWG defines acceptable complaint behavior through their Sender Best Common Practices. They recommend complaint rates below 0.1% as target performance, with rates approaching 0.3% requiring immediate attention.

Beyond rates, M3AAWG addresses complaint handling process. Complaints should trigger immediate suppression of the complaining address. Investigation should identify patterns suggesting content, targeting, or consent issues.

M3AAWG also recommends feedback loop participation to receive complaint notifications from providers. Processing FBL reports promptly and suppressing complainers before the next send prevents repeat complaints that compound reputation damage.