Yes. If my therapist emails something in depth, I always reply, but not in a way that suggests I'm looking for an ongoing thread back and forth, more like something to acknowledge what she's taken the time to share. If it's a brief reply from her, I usually, but not always, write thanks back to her. Too much gets swallowed up by the ethers and I like people to know when their message was received. People who text me are not likely to hear back because I have so many notifications that if I don't see one coming in, it will sit there for an eternity. For a long time, I thought that the message icon on a phone was supposed to have a red bubble by it. So this is just a me thing and not a standard email or text etiquette thing.