State: OK on 2019/07
Preparations: mail.cock.li both for IMAP and SMTP
Comments: Free/Hate Speech (due to the domains not people in my experience) mail service used by some people in the Fediverse that provides some domains: cock.li, airmail.cc, 8chan.co, redchan.it, 420blaze.it, aaathats3as.com, cumallover.me, dicksinhisan.us, loves.dicksinhisan.us, wants.dicksinhisan.us, dicksinmyan.us, loves.dicksinmyan.us, wants.dicksinmyan.us, goat.si, horsefucker.org, national.shitposting.agency, nigge.rs, tfwno.gf, cock.lu, cock.email, firemail.cc, hitler.rocks, getbackinthe.kitchen, memeware.net, cocaine.ninja, waifu.club, rape.lol and nuke.africa.
It seems has no policy about sending many mails https://cock.li/tos: A user reported to be banned some days after using it. No problem with other users.