Email Setup Wizard

Fastmail + Cloudflare

Set up Fastmail email on Cloudflare

The records Fastmail needs, written with the field names Cloudflare uses (Name, Mail server, Content, Target), in the order to add them.

  • 4 steps
  • 7 DNS records
  • Sources checked October 21, 2026

Before you start

  1. Have your Fastmail account ready. Some values are unique to your account and come from the Fastmail Settings.
  2. Open DNS at Cloudflare: Sign in to the Cloudflare dashboard and select your domain. Open the DNS Records page.
  3. Keep both tabs open and add the records below one at a time.

Records to add

Copy each value with the button next to it. Rows marked “Copy from Fastmail Settings” are unique to your account.

MX records Where incoming email goes Type MX Name @ Value in1-smtp.messagingengine.com Priority 10 TTL Auto
MX records Where incoming email goes Type MX Name @ Value in2-smtp.messagingengine.com Priority 20 TTL Auto
SPF record Which servers may send as you Type TXT Name @ Value v=spf1 include:spf.messagingengine.com ?all Priority n/a TTL Auto
DKIM A signature on every message Type CNAME Name fm1._domainkey Value fm1.yourdomain.com.dkim.fmhosted.com Priority n/a TTL Auto
DKIM A signature on every message Type CNAME Name fm2._domainkey Value fm2.yourdomain.com.dkim.fmhosted.com Priority n/a TTL Auto
DKIM A signature on every message Type CNAME Name fm3._domainkey Value fm3.yourdomain.com.dkim.fmhosted.com Priority n/a TTL Auto
DMARC record What to do with fakes · recommended Type TXT Name _dmarc Value v=DMARC1; p=none; Priority n/a TTL Auto

Step by step in Cloudflare

Point your MX records

MX records tell every other mail server where to deliver email for your domain. They must point to your provider and nowhere else.

Type
MX
Name
@
Priority
10
Mail server
in1-smtp.messagingengine.com
Type
MX
Name
@
Priority
20
Mail server
in2-smtp.messagingengine.com

In Cloudflare

  1. On the DNS Records page, select Add record.
  2. Choose MX as the Type.
  3. Fill in Name, Mail server and Priority.
  4. Select Save.
  5. Delete any other MX records: select Edit on each one, then Delete, and confirm.
  6. Repeat for each MX record above.

Add the SPF record

SPF is a TXT record that lists the services allowed to send email from your domain, so receivers can spot forgeries.

Type
TXT
Name
@
Content
v=spf1 include:spf.messagingengine.com ?all
  • This is the exact value from Fastmail's manual DNS guide, which ends in ?all (neutral).

In Cloudflare

  1. On the DNS Records page, select Add record.
  2. Choose TXT as the Type.
  3. Fill in Name and Content.
  4. Select Save.

Set up DKIM

DKIM publishes a public key so receivers can confirm your messages really came from you and were not changed on the way.

Type
CNAME
Name
fm1._domainkey
Target
fm1.yourdomain.com.dkim.fmhosted.com
Type
CNAME
Name
fm2._domainkey
Target
fm2.yourdomain.com.dkim.fmhosted.com
Type
CNAME
Name
fm3._domainkey
Target
fm3.yourdomain.com.dkim.fmhosted.com

In Cloudflare

  1. On the DNS Records page, select Add record.
  2. Choose CNAME as the Type.
  3. Fill in Name and Target.
  4. Set Proxy status to DNS only (grey cloud).
  5. Select Save.
  6. Repeat for each CNAME record above.

Add the DMARC record (recommended)

DMARC tells receivers what to do with mail that fails SPF and DKIM, and where to send reports about it.

Type
TXT
Name
_dmarc
Content
v=DMARC1; p=none;

In Cloudflare

  1. On the DNS Records page, select Add record.
  2. Choose TXT as the Type.
  3. Fill in Name and Content.
  4. Select Save.

Check your setup

Once the records are saved, run a live check. We look up your domain in public DNS and tell you what is right, missing or wrong, with the fix in Cloudflare’s words.

We only read public DNS records. Nothing is stored.

Common mistakes with Fastmail on Cloudflare

Adding fewer than three DKIM records

Fastmail signs with three selectors (fm1, fm2, fm3). All three CNAMEs are required.

Adding a second SPF record

Only one record may start with v=spf1. Merge Fastmail's include into the existing one.

Cloudflare: Keep email CNAMEs on DNS only

Set Proxy status to DNS only (grey cloud) for DKIM and verification CNAME records. Cloudflare says records used for email or domain verification should not be proxied, and may block proxying DKIM CNAMEs.

Cloudflare: Turn off Cloudflare Email Routing first

If Email Routing is on, Cloudflare has added locked MX records (route1, route2 and route3.mx.cloudflare.net) and an SPF record with include:_spf.mx.cloudflare.net. Unlock them or disable Email Routing (Compute > Email Service > Email Routing > your domain > Settings) before switching to another provider. Email Routing can't be used with an outside mail server.

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Fastmail on Cloudflare: questions

Where do I add Fastmail DNS records in Cloudflare?

Sign in to the Cloudflare dashboard and select your domain. Open the DNS Records page. Add each record there, one at a time.

What goes in the Name field at Cloudflare?

Enter @ for records on your bare domain, such as MX and SPF. For the others, enter only the part before your domain, for example fm1._domainkey. Cloudflare adds your domain automatically.

Do I need to delete my existing MX records at Cloudflare?

Yes. Mail servers deliver to every MX record you publish, so keep only the Fastmail MX records and delete the rest. If Email Routing is on, Cloudflare has added locked MX records (route1, route2 and route3.mx.cloudflare.net) and an SPF record with include:_spf.mx.cloudflare.net. Unlock them or disable Email Routing (Compute > Email Service > Email Routing > your domain > Settings) before switching to another provider. Email Routing can't be used with an outside mail server.

Where do I get my Fastmail DKIM record?

Fastmail DKIM records are CNAME records whose value includes your domain, for example fm1.yourdomain.com.dkim.fmhosted.com. Copy the exact values for your domain from the table on this page.

Sources

Every value and step on this page comes from these official pages. Dashboards change, so if something doesn’t match what you see, tell us.

Fastmail on other hosts

Other email providers on Cloudflare