SPF, DKIM, DMARC, MX, and CAA configuration
SPF
18
/25
DMARC
16
/30
DKIM
0
/20
MX
10
/10
CAA
v=spf1 mx a include:ispgateway.de ~all
v=DMARC1; p=none; rua=mailto:dmarc@gruenton-berlin.de
mxlb.ispgateway.de.