Hi sanj,
Open-rate "how many users read this message" tracking is unfortunately not possible in text email.
Simple link tracking is currently available in LMP, but there is not (yet) the ability to track conversions. I do have experience with cookies required to accomplish this, though, and agree it would be a
great addition to LMP. I will forward this to the suggestions forum so I don't forget to consider it for future updates. This may also be possible with some custom PHP script, but you'd have to be a programmer for that.
Regards