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Derek Ross | 5 months ago (raw) | root | parent | reply | flag 
 But you can't. That's my point. No one is writing applications to that query the world's SQL databases.
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tegila | 5 months ago (raw) | root | parent | reply | flag 
 No one is going to have an open relay at 0 cost. 

That’s why they block “spam”. 
Any server maintainer want to keep only his opinion-like-minded “good spam”.

Neither MySQL, Mail or websocket (nostr) will relay anything without a pre-filter.