bin/rumble in rumble-0.7.0 vs bin/rumble in rumble-0.8.0

@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
-# Copyright (c) 2018-2022 Yegor Bugayenko
+# Copyright (c) 2018-2024 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
 # in the Software without restriction, including without limitation the rights
 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
@@ -21,11 +21,10 @@
 
 STDOUT.sync = true
 
 require 'slop'
 require 'mail'
-require 'net/smtp/proxy'
 require_relative '../lib/rumble'
 require_relative '../lib/rumble/version'
 require_relative '../lib/rumble/cli'
 
 begin
@@ -97,35 +96,19 @@
       raise '--host is required' unless opts[:host]
       raise '--port is required' unless opts[:port]
       raise '--user is required' unless opts[:user]
       raise '--password is required' unless opts[:password]
       from = Mail::Address.new(opts[:from])
-      if opts[:proxy]
-        scheme, host, port = opts[:proxy].strip.split(':')
-        delivery_method Net::SMTP::Proxy::DeliveryMethod, {
-          domain: from.domain,
-          address: opts[:host],
-          port: opts[:port],
-          proxy_address: "#{scheme}://#{host}",
-          proxy_port: port.to_i,
-          authentication: 'plain',
-          openssl_verify_mode: OpenSSL::SSL::VERIFY_NONE,
-          enable_starttls_auto: true,
-          enable_starttls: true,
-          user_name: opts[:user],
-          password: opts[:password]
-        }
-      else
-        delivery_method :smtp, {
-          domain: from.domain,
-          address: opts[:host],
-          port: opts[:port],
-          user_name: opts[:user],
-          password: opts[:password],
-          enable_starttls: true,
-          enable_starttls_auto: true
-        }
-      end
+      raise 'The --proxy option is not supporte' if opts[:proxy]
+      delivery_method :smtp, {
+        domain: from.domain,
+        address: opts[:host],
+        port: opts[:port],
+        user_name: opts[:user],
+        password: opts[:password],
+        enable_starttls: true,
+        enable_starttls_auto: true
+      }
     else
       raise "Delivery method #{opts[:method]} is not supported"
     end
   end
   Rumble::CLI.new(opts).send