app/controllers/marketing_controller.rb
class MarketingController < ApplicationController
def send_email
if request.post?
receivers = params[:receivers]&.split(",")
content = params[:content]
receivers.each do |receiver|
next unless receiver.present? && receiver =~ User::VALID_EMAIL_REGEX
ManualMailer.create(to: receiver, message: content).deliver_later
end
flash[:success] = "Sent!"
end
end
end