Private Messaging Options 
Admin Control Panel > vBulletin Options > vBulletin Options > Private Messaging Options

Private Messaging Enabled (yes/no)

Turns the entire private messaging system on and off.

Instant Messaging Support - Check for New Private Messages (yes/no)

Selecting 'Yes' for this option will cause the system to check the private message database every time a user loads a page, and will display a visible prompt if a new message has just been saved.

Maximum Characters Per Private Message (default: 5000)

Maximum characters to allow in a private message.

Set this to 0 for no limit.

Floodcheck - Minimum Time Between Messages (default: 60)

Private Message Flood Checking. Select the minimum time that must pass before a user can send another private message. This is to prevent a single user 'spamming' by sending lots of messages very quickly.

Set this to 0 to disable the option.

Default Messages Per-Page (default: 50)

This setting allows you to define the default number of messages displayed per-page on the private messages listings pages.

Maximum Messages Per-Page (default: 100)

This setting allows you to limit the number of messages users may display per page on the private messages folder view pages.

Allow Message Icons for Private Messages (yes/no)

Allow the use of the standard message icons for private messages.

Allow vB Code in Private Messages (yes/no)

Allow users to include vB Code in their Private Messages? (Such as [b], [i] etc.)

Allow Smilies in Private Messages (yes/no)

Allows users to include smilies in their Private Messages.

Allow [IMG] Code in Private Messages (yes/no)

Allows users to include [IMG] codes in their Private Messages.

Allow HTML in Private Messages (yes/no)

Allow users to include raw HTML code in their Private Messages?
(Strongly not recommended.)



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