well... good question.
First, the easy part. Yes, in Unity 2.3.6 build 22 and later you can turn off receipts showing up in your message stack entirely by editing the registry. Please be careful when doing this, as always. In the registry go to "HKLM | Software |Active Voice | Conversations | 1.0 ". You need to add a new key in this branch called "Exclude Return Receipts" and set it to "1". Be sure to spell and space it exactly as I have here. When you retsart Unity the next time, no receipts will be offered to users in the message stack over the phone. This is, of course, a system wide option so it affect all users.
The hard part is explaining why this is... in a nutshell, filtering your inbox for different messages is expensive and kinda slow, especially if you have a lot of message there (and most folks do). As a result we tried to simplify the filters as much as possible and lump all receipts (NDR, return receipts etc...) together and offer them in one of the 3 main stack (voice, email, fax) to speed things up. We went with the voice stack since if you requested a return receipt for a voice message and you don't have TTS turned on for your account, you wouldn't get an email stack at all so this was the best "lowest common denominator" solution. Yes, it is annoying getting email receipts presented in your voice mail stack, especially if you get lots of them.
We're working on breaking out all the receipts and NDRs (voice, fax, email and otherwise) into their own stack for a future version which should make this a little nicer for folks to deal with.
Jeff Lindborg
Unity Product Architect
Active Voice Corp
jlindborg@activevoice.com
