The problem with following mail domains used for registration of propaganda spam bots is, that they are recycling them quickly, burn them after few registered accounts and don't reuse them. So exchanging block lists won't help, unless we would be able to update on almost hourly basis. But maybe someone will be able to recognize some patterns in domain ownership... who knows.
nembors.com
speakerion.com
img-free.com
emailcoffeehouse.com
openmail.pro
chamconnho.com
taxibmt.net
maillog.uk
anysilo.com
auslank.com
aiwanlab.com
noidos.com
gamegta.com
hh7f.com
perfectth.com
djkux.com
ampdial.com
capiena.com
nrlord.com
fergetic.com
fandoe.com
burangir.com
fermiro.com
bdnets.com
apocaw.com
haotuwu.com
fixwap.com
dwakm.com
elygifts.com
mail.wabblywabble.com
mail.wallywatts.com
Fediverse/ActivityPub is relatively spam-resistant scheme... if registrations are closed. Being doorkeeper, allowing registrations of serious new users open, is a challenge. But as I believe in open society, I don't want to give up. This is what *they* want from us ... to form isolated social bubbles.