As you know i always use the Voucher code method and never once had an email confirmation from NowTV 
I always take a screen shot after applying the voucher to my passes (just in case something goes wrong on my account) however, i would imagine most NowTV customers would not consider doing this which is understandable.
Never had any NowTV promo offers, only time that i ever get an official email from NowTV was when i purchased a Sports Pass, cancelled a Months Sports Pass and lastly anytime NowTV increases their prices.
Like you i have "opted in" to receive NowTV emails.
Looking back on one of my accounts, I've received confirmation of voucher codes added successfully, such as these
Bit old but I tend not to keep them so lucky to come across. I've also found a few confirmation of cancellations. However for my main account I don't receive emails for payments or cancellations nor promotional emails that I do get sent to the other account, so there is something amiss. On my main account I opted out of promo emails at first, then opted back in a long time ago, queried it with NOW TV team but they said I was opted in fine and should receive everything.
If if its an issue with some accounts for some reason then it does need looking at.
For instance some users are telling customers they will receive confirmation if they have cancelled properly but it looks like you can't guarantee this is happening, nor the reverse that if they didn't get an email then it means they didn't cancel properly.
What's baffling is that when i purchased or applied a voucher relating to the Sports Passes either Day or Month (never tried a Week Sports Pass so can not confirm) that i always received a Now TV email notification, together with a cancel email confirmation when i cancelled my Month Sports Pass.
Since joining NowTV i must have applied more than twenty five passes (entertainment & cinema) and never once had an email confirmation from NowTV that the voucher code was added to my account.
Apart from cancelling my Month Sports Pass where i received an email notification, i cannot confirm the email cancellation notification for a entertainment or cinema pass due to that i have never to date cancelled these passes.
Never once had a NowTV promo offer of any type, which is disheartening where you read on the forums that other members seem to be getting these special deals or offers and you begin to think to yourself why don't i never get these offers myself
I also seem to get the NowTV Trial invitation emails with no problems (must have had about three email invitations for the latest coming soon trials in the last two weeks) 
