[ars]

Instead of linking to my email address, which I would never allow, let me just forward the relevant emails to you, i.e. to a special email address linked to me account.

It's pretty easy to add a rule in most email providers that forward only message matching certain patterns - you could even provide documentation of what patterns to include.

[cookiemonsta]

If i understand what you mean correctly, this is what tripit.com does (and they do it very well). I just forward plane/hotel bookings and it get imported into my account straight away.