Campaign Monitor email authentication
Design-focused newsletter platform popular with agencies.
SPF record
Add Campaign Monitor to your domain's SPF record with this include:
include:cmail1.com
A complete record for a domain sending only through Campaign Monitor:
v=spf1 include:cmail1.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 6 IP ranges.
Live record
This is what cmail1.com published when this page was generated:
v=spf1 ip4:103.28.42.0/24 ip4:27.126.146.0/24 ip4:146.88.28.0/24 ip4:163.47.180.0/22 ip4:203.55.21.0/24 ip4:204.75.142.0/24 ~all
Domains using Campaign Monitor
Found while resolving 293 well-known domains on 2026-08-04 — each authorises
cmail1.com in its published SPF record:
DKIM
Enable DKIM inside Campaign Monitor 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 Campaign Monitor 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.