Every card by bureau will surely be answered by bureau.
The direct address of the DARC QSL bureau is
DARC bureau, Lindenallee 4, 34225 Baunatal, Germany.
Send your reception report or QSL card and 1 IRC to
Daniel Moeller, Kolonnenstrasse 20, 10829 Berlin/Germany.
As an alternative to an IRC you can send 1,20 Euro postage via PayPal. To get the link just contact me.