Of course, I know it’s no longer possible to get a transaction mined without a miner fee since 2011.
It’s for sending from a single address to a single output address. But I have to split the sending in a large amount of transactions.
I only knows about Gdax which pays the transaction fee for the user (thus making sending transaction free), but it requires sending identity document in order to use it.
This question isn’t about doing it… It’s about getting answer that might explain how to do it without knowing an e‑mail address !
Other questions aren’t asking this so that concern cannot be answered on other questions !