truemail_test.rb

require 'truemail'
require 'minitest/spec'
require 'minitest/autorun'

Truemail.configure do |config|
  config.verifier_email = 'yourname@example.com'
  config.smtp_safe_check = true # setting to false makes SMTP validation fail
end

def valid?(email)
  r = Truemail.validate(email, with: :regex)
  m = Truemail.validate(email, with: :mx)
  s = Truemail.validate(email)

  r.result.success &
  m.result.success &
  s.result.success
end

GOOD = [
  # your legit email adresses go here
]

BAD = [
  # spam emails
  "KISwusu156re4@optus.com.au",
  "ffgw@proton.dnsprotect.com",
  "ebula@cns49.unlimithost.com",

  # bogus email — makes the tests pass
  "myself@pataflafla.xxx"
]

describe "testing a set of random emails with Truemail" do
  it "validates all good emails as good" do
    good = GOOD.reduce(true) { |bool, addr| bool & valid?(addr)  }
   _(good).must_equal true
  end

  # all spam emails validate!
  it "marks at least one spam email as bad" do
    bad = BAD.reduce(true) { |bool, addr| bool & valid?(addr)  }
   _(bad).must_equal false
  end
end

So this is me figuring out whether the Truemail gem (https://github.com/truemail-rb) also detects spam email addresses. Turns out, it does not. It only detects non-existing addresses. Add your emails to the test case above and see if all tests pass.