Dicas de servidores de e-mail:

aktivix.org
autistici.org
boum.org
cryptix.de
disroot.org
domainepublic.net
effraie.org
espiv.net
free.de
globenet.org
herbesfolles.org
immerda.ch
koumbit.org
lautre.net
mayfirst.org
moviments.net
mutins.net
nadir.org
no-log.org
nodo50.org
nostate.net
poivron.org
puscii.nl
rezo.net
riseup.net
sindominio.net
squat.net
systemausfall.org
systemli.org
tachanka.org
toile-libre.org

Mais aqui: https://riseup.net/en/security/resources/radical-servers