Email Notification for all users

[User 2877]

http://en.wikipedia.org/wiki/CAN-SPAM_Act_of_2003

Yes...it is. You are bulk emailing people without their permission.

A couple complaints to Godaddy and they shut off your hosting and suspend your domain too.

Unfortunately I have to point to a VB thread as it's probably the best explanation dealing with forums:

http://www.vbulletin.org/forum/showthread.php?t=180732

Subscription
Each user on your distribution list should opt to receive messages from you in one of the following ways (opt-in):
• Through an email asking to subscribe to your list.
• By manually checking a box on a web form, or within a piece of software.
We also recommend that you verify each email address before subscribing them to your list.

*As discussed above.

The following methods of address collection are not considered 'opt-in' and are not recommended:
• Using an email address list purchased from a third-party.

*Speaks for itself.

• Setting a checkbox on a web form or within a piece of software to subscribe all users by default (requiring users to explicitly opt-out of mailings).

*In other words;
adminCP -> vbulletin options -> User registration options -> default registration options
should not have “automatic thread subscription” set to receive email notification.