Spamhaus banned my customer's domain without any legitimate reason.
Spamhaus banned our customer's email address despite absolutely no spam activity whatsoever.
When we requested an explanation, they refused to provide any specific reason, replying only with a vague list of "good email practices" and stating that the domain was "not eligible for removal."
No other spam monitoring service (out of the hundreds available) has flagged my customer's email as spam. Only poor email providers like gmx.de and web.de, which rely blindly on Spamhaus listings, have caused minor delivery issues.
Thankfully, for serious email providers, Spamhaus is irrelevant.
Their opaque, authoritarian practices are harmful to legitimate businesses. Services like Spamhaus, which act without transparency, oversight, or accountability, should be shut down.