This account https://etherscan.io/address/0xbe7cd41e060cdb07c548d6c65f1d786e43f1c392 is able to keep sending transactions with zero gas price and they are mined. If I try to do the same, my transactions will get stuck forever.
Example: https://etherscan.io/tx/0x13dd2fbbf9d403001623a6f90ab66ccd585832f14e38401806fa7d1e1f7f9013
How is this being done?