German to English Other General / Conversation / Greetings / Letters Letter about mailing list and prize draw

Bitte beachten Sie dabei den Teilnahmeschluss, der auf dem Formular verzeichnet ist: Spätere Zusendungen können nicht mehr berücksichtigt werden. Teilnehmen können alle Originaladressaten des Teilnahmeformulars.

I am having trouble with that last sentence. This is an excerpt from a letter. The company in question is re-organising their database and wants the readers of its newsletter to send back a form indicating that they would still like to be included on the mailing list for the newsletter in future. As incentive to complete the form, there is also the opportunity to take part in a prize draw.

My question is, what is meant by 'Originaladressaten'? The 'original' bit is confusing me. Does this mean the original recipients of the newsletter (before the database is re-organised), or am I over-analysing this?

Thanks in advance for your input!