[TYPO3] Hook direct_mail_subscription

[Jeroen Visser | ROQUIN E-Solutions]

Hi all,
For the unsubscription from a newsletter, in the table tt_address in 
combination with direct_mail_subscription, a own added record needs to 
be set to 1 or 0 in the table tt_address.

Can somebody tell me where I can hook in on this process:
"index.php?id=75&*cmd=setfixed&sFK=DELETE*&rU=370&fD%5B_FIELDLIST%5D=uid&aC=1f090969"
or
"index.php?id=75&rU=370&aC=1f090969&*cmd=delete*"

Thank's in advance.

Kind regards,
Jeroen