vBulletin Mods

Hello all! :)

I need a technical advice from some vbulletin experts about a function of vBulletin (Thread Subscriptions). I'm a vbulletin developer too, but since we're talking a production site with lots of members, I need more advices.

Well,
- We need to bring more old members on our board.
- We have already "Instant notify by e-mail" as default subscription at registration, so lots of members that have reply to a thread they are also subscribed to that thread automatically

... the issue is that:
- Since the last some years we had issue with Microsoft accounts (e-mails never sent to @hotmail/ @msn/ @windowslive etc) ++ a very large part of our member using Microsoft accounts), I'm afraid that lots of e-mail never sent.
And we can read this inside an e-mail of vbulletin:

So we need to "reset" this functionality, so from now and then all members will receive an instant subscription's e-mail, and after that first notification for each thread, next they will not received as should (and that above phrase said).

You can read this inside /includes/functions_newpost.php (function: exec_send_notification()) :

Block Disabled:      (Update License Status)
Suspended or Unlicensed Members Cannot View Code.

As I understand, the hot part is that:

Block Disabled:      (Update License Status)
Suspended or Unlicensed Members Cannot View Code.

But how I could achieve that I need?
Maybe to create a new unixtimestamp column on "user" table or something else? :)