The latest edition of the electronic publication QSL.window (October 2019) is posted on the DXways-br blog, with recent updates on where to send receipt reports based on the success of several DX-er's in Brazil and from other countries.
This list is totally free, and may (should) be disclosed to as many radio friends as possible.
Link: http: //dxways-br.blogspot.com, and then click on 'QSL.window October 2019' (on the right side).
São Bernardo SP, BRAZIL
Hard-Core-DX mailing list