Thanks for looking into this.
Headers from a failed message (verified by dkimpy-milter):
Authentication-Results: box.opamolen.nl; dkim=fail (0) header.d=zunt.nl header.a=rsa-sha256 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=zunt.nl; s=soverin; t=1639301818; bh=pdCsjgdUGC9ngruiBr/RTGpZwMaQSHZtMBMugF68NFU=; h=Date:From:To:Subject:From; b=R66g6/JMyM1M3CGe05fSiHYrPSh9az/eqTkvXJx/FvgOWaihFp/fmYTQNIOp3vmUS DiPfngQRWUkE8gJWc16Jmq/GSkXiAwkfMOIMsjMdDKRPpFZ0vwib0Uu460QS8fVXAC G1aTeFaEQGdTawSndj8bUP61/7k2ow3IxQWbgpn8dZSS1R3vyZKnztkndylj2EdW5T Cz3qy9lPaldsaRbghrmV8bwc/GxKWZP4J80c5SnD4F5eCrZWylKQbja5Y1jTZ3QN36 Bkrwyq0LlMm/vTnvCQfKNMaNsSnJCuT35Si1mAqSDn701wpcR/uU0IE4RXbfWySjnF v0jqmT9/mmJPg==
Selector would be "soverin", sender domain "zunt.nl" receiver domain: opamolen.nl
A similar message, received using openDKIM:
Authentication-Results: box.opamolen.nl; dkim=pass (2048-bit key; secure) header.d=zunt.nl <email address hidden> header.a=rsa-sha256 header.s=soverin header.b=fii7McOD; dkim-atps=neutral DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=zunt.nl; s=soverin; t=1639302102; bh=ZbpseU1KQZauIUDI9RQmSYejOdBdpS+3yj8WmES6XHM=; h=Date:From:To:Subject:From; b=fii7McODpjIQxyH13+GtuoztGS6KQGdcz4qVlucEU5rO72eyo1PkHcAK/0PlTzKTo 8jJUg4zOSrm6YQrG0SsCePeb6Iid0ekV2FkIX7JbasAMJjCFzunlKSEbl25wl5ign6 0HboXqBso9QWlGPxEHdJQK5jGR/uBwKN8DjrMP6wF+5JJiWM8MMPZOJvMWo3Jvoqcx ReP03t2YP5G77qXhpBu8FELQxiKceMuezldVYI3O1xFwRwK4SNG/otDKc33rwVoXaB KiEDO6tdHDflEAgnOarkoDbZfieHKlY4BdDDLL49nJ3y6Xd3P89rtz3CdMDBX6v4Hl mq53dNZa8RoeQ==
Thanks for looking into this.
Headers from a failed message (verified by dkimpy-milter):
Authentication- Results: box.opamolen.nl; dkim=fail (0) header.d=zunt.nl a=rsa-sha256 gruiBr/ RTGpZwMaQSHZtMB MugF68NFU= ; From:To: Subject: From; JMyM1M3CGe05fSi HYrPSh9az/ eqTkvXJx/ FvgOWaihFp/ fmYTQNIOp3vmUS E8gJWc16Jmq/ GSkXiAwkfMOIMsj MdDKRPpFZ0vwib0 Uu460QS8fVXAC TawSndj8bUP61/ 7k2ow3IxQWbgpn8 dZSS1R3vyZKnztk ndylj2EdW5T saRbghrmV8bwc/ GxKWZP4J80c5SnD 4F5eCrZWylKQbja 5Y1jTZ3QN36 /vTnvCQfKNMaNsS nJCuT35Si1mAqSD n701wpcR/ uU0IE4RXbfWySjn F
header.
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=zunt.nl; s=soverin;
t=1639301818; bh=pdCsjgdUGC9n
h=Date:
b=R66g6/
DiPfngQRWUk
G1aTeFaEQGd
Cz3qy9lPald
Bkrwyq0LlMm
v0jqmT9/mmJPg==
Selector would be "soverin", sender domain "zunt.nl" receiver domain: opamolen.nl
A similar message, received using openDKIM:
Authentication- Results: box.opamolen.nl; atps=neutral IUDI9RQmSYejOdB dpS+3yj8WmES6XH M=; From:To: Subject: From; jIQxyH13+ GtuoztGS6KQGdcz 4qVlucEU5rO72ey o1PkHcAK/ 0PlTzKTo 6YQrG0SsCePeb6I id0ekV2FkIX7Jba sAMJjCFzunlKSEb l25wl5ign6 WlGPxEHdJQK5jGR /uBwKN8DjrMP6wF +5JJiWM8MMPZOJv MWo3Jvoqcx 77qXhpBu8FELQxi KceMuezldVYI3O1 xFwRwK4SNG/ otDKc33rwVoXaB lEAgnOarkoDbZfi eHKlY4BdDDLL49n J3y6Xd3P89rtz3C dMDBX6v4Hl
dkim=pass (2048-bit key; secure) header.d=zunt.nl <email address hidden> header.a=rsa-sha256 header.s=soverin header.b=fii7McOD;
dkim-
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=zunt.nl; s=soverin;
t=1639302102; bh=ZbpseU1KQZau
h=Date:
b=fii7McODp
8jJUg4zOSrm
0HboXqBso9Q
ReP03t2YP5G
KiEDO6tdHDf
mq53dNZa8RoeQ==