IONOS Mail email authentication
European hosting provider’s bundled mailbox service.
SPF record
Add IONOS Mail to your domain's SPF record with this include:
include:_spf-eu.ionos.com
A complete record for a domain sending only through IONOS Mail:
v=spf1 include:_spf-eu.ionos.com ~all
What it costs you
1 of your 10 DNS lookups. That is the cheapest an include can be — the record it points at contains only IP ranges, with no further includes to follow. Behind it are 9 IP ranges.
Live record
This is what _spf-eu.ionos.com published when this page was generated:
v=spf1 ip4:212.227.126.128/25 ip4:82.165.159.0/26 ip4:212.227.15.0/25 ip4:212.227.17.0/27 ip4:217.72.192.64/26 ip4:185.48.116.13/32 ip4:212.227.25.128/25 ip6:2001:8d8:5c2::/64 ip6:2001:8d8:5c5::/64 ?all
DKIM
Enable DKIM inside IONOS Mail and publish the selector record it generates. DKIM matters more than SPF for deliverability, because a DKIM signature survives forwarding while SPF does not — see how selectors work.
DMARC
Neither SPF nor DKIM protects the address your recipients actually see until DMARC ties them
to it. Once IONOS Mail is authenticating, publish a DMARC record — start at
p=none with a reporting address and
tighten from there.
Check it worked
DNS changes take minutes to hours to propagate. Once published, run the domain through the checker — it resolves the full include chain and reports the real lookup count.