Every reception report will be confirmed the same way it arrived.
QSL card: An incoming QSL card via bureau will be confirmed by a QSL card via bureau. An incoming QSL card via lettre will be confirmed by lettre.
SWL and reception reports: Incoming reception reports via bureau will be confirmed by a QSL card via bureau. An incoming reception report via lettre will be confirmed by lettre.
E-Mails: Incoming reception of any kind via E-Mail will be confirmed by an E-Mail. QSL cards will not be sent by E-Mail.
eQSL: Incoming reports via eQSL will be confirmed via eQSL.
QSL via bureau:
c/o Daniel Möller
DL3RTL/b: via DL3RTL
DN3RTL: via DL3RTL