ATTN: list moderator

I keep recieving the following message:
"Your mail to 'Plug-discuss' with the subject:

    <insert subject here>

Is being held until the list moderator can review it for approval.

The reason it is being held:

    Only approved posters may post without moderator approval.

Either the message will get posted to the list, or you will receive
notification of the moderator's decision."

Could you please solve this?
I thought I was approved for the list as a poster....

hawke