Notify_util passes port as binary string to gen smtp client, it wants an...

... int

Relavent Code in gen_smtp_client:489
https://github.com/2600hz/kazoo/blob/master/deps/gen_smtp-0.0.1/src/gen_smtp_client.erl#L489
```erlang
	Port = case proplists:get_value(port, Options) of
		undefined when Proto =:= ssl ->
			465;
		OPort when is_integer(OPort) ->
			OPort;
		_ ->
			25
	end,
```