Yes! After you have sent a message to a parent, they will respond. Responses are kept in ReachMyTeach and will also come to your email.
You can respond from your email and it will go out however you initiated the message.
For example, if you sent the message over text and the parent speaks Portuguese, then when you respond from your email it will go back out over text and in Portuguese!
You can always check this it true by going to your sent folder in ReachMyTeach.