postmark.rake

namespace :postmark do
  desc "Sync bounces from postmark to users"
  task :sync_bounces => [:environment] do
    client = Postmark::ApiClient.new("your api key here")

    suppressions = client.dump_suppressions("outbound", type: "bounces")

    suppressions.each do |suppression|
      if user = User.find_by(email: suppression[:email_address])
        user.update(
          email_bounced_at: suppression[:created_at],
          email_bounce_details: suppression[:suppression_reason]
        )
      else
        # You might as well use the Postmark API to delete
        # those dangling supressions here.
      end
    end
  end
end