diff --git a/main.rb b/main.rb
deleted file mode 100755
index acf92fad..00000000
--- a/main.rb
+++ /dev/null
@@ -1,44 +0,0 @@
-#!/usr/bin/env ruby
-# frozen_string_literal: true
-
-require 'net/smtp'
-
-# Inputs
-server_address = ENV['INPUT_SERVER_ADDRESS']
-server_port = ENV['INPUT_SERVER_PORT']
-username = ENV['INPUT_USERNAME']
-password = ENV['INPUT_PASSWORD']
-subject = ENV['INPUT_SUBJECT']
-body = ENV['INPUT_BODY']
-to = ENV['INPUT_TO']
-from = ENV['INPUT_FROM']
-content_type = ENV['INPUT_CONTENT_TYPE'] || 'text/plain'
-
-# Body
-prefix = 'file://'
-body = if body.start_with?(prefix)
-         path = body.delete_prefix(prefix)
-         File.read(path)
-       else
-         body
-       end
-
-# Message
-message = <<~END_OF_MESSAGE
-  Content-Type: #{content_type}; charset=utf-8
-  Subject: #{subject}
-  From: #{from} <#{username}>
-
-  #{body}
-END_OF_MESSAGE
-
-# Send
-begin
-  smtp = Net::SMTP.new(server_address, server_port.to_i)
-  smtp.enable_tls
-  smtp.start(server_address, username, password, :login)
-  smtp.send_message(message, username, to.split(','))
-rescue StandardError => e
-  puts "Error: #{e.message}"
-  exit 1
-end