generate a 1024-bit key for the default DKIM signing key

script/generate_initial_config.rb

@@ -41,7 +41,7 @@ unless File.exists?(Postal.lets_encrypt_private_key_path)
 end
 
 unless File.exists?(Postal.signing_key_path)
-  key = OpenSSL::PKey::RSA.new(2048).to_s
+  key = OpenSSL::PKey::RSA.new(1024).to_s
   File.open(Postal.signing_key_path, 'w') { |f| f.write(key) }
   puts "Created new signing key for DKIM & HTTP requests"
 end