@Andras7 What I'm talking about is that once a guest has a confirmed reservation with you, you will see a coded airbnb email address for them UNDER their profile photo (you may have to scroll down a little) along with their phone number. You can send an email to them using that address and it will go directly to their email inbox. The guest sees a coded email address for you as well, and if they use that, it will appear in your email inbox just like a regular email.
So those emails are easily referred to if I need to check back on something, I created an airbnb folder in my email inbox and just right away move them over to that so they don't get lost in all the other emails. You could even create a separate folder for each guest, and just delete them when no longer needed.
But I also communicate mainly thru airbnb messaging, it's just if I need to send a map or photo that I use the email option.
I'd be interested to know if you find you can attach a photo to a reply to an email notification- I kind of doubt it, as the message system doesn't support attachments.