Fastmail + Cloudflare
Set up Fastmail 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
Before you start
- Have your Fastmail account ready. Some values are unique to your account and come from the Fastmail Settings .
- Open DNS at Cloudflare: Sign in to the Cloudflare dashboard and select your domain. Open the DNS Records page.
- Keep both tabs open and add the records below one at a time.
Fastmail on Cloudflare: what to know
How long changes take
Cloudflare says changes to your DNS records take effect worldwide within 5 minutes, usually much less. A record you replaced can stay cached until its old TTL runs out.
Source: FAQ (Cloudflare DNS Docs)
Records to add
Copy each value with the button next to it. Rows marked “Copy from Fastmail Settings” are unique to your account.
| Record | Type | Name | Value | Priority | TTL | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| 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 other mail servers where to deliver your email. How MX works
- Type
- MX
- Name
-
@ - Priority
- 10
- Mail server
-
in1-smtp.messagingengine.com
- Type
- MX
- Name
-
@ - Priority
- 20
- Mail server
-
in2-smtp.messagingengine.com
In Cloudflare
- On the DNS Records page, select Add record.
- Choose MX as the Type.
- Fill in Name, Mail server and Priority.
- Select Save.
- Delete any other MX records: select Edit on each one, then Delete, and confirm.
- Repeat for each MX record above.
Add the SPF record
SPF lists the services allowed to send email as you. How SPF works
- 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
- On the DNS Records page, select Add record.
- Choose TXT as the Type.
- Fill in Name and Content.
- Select Save.
Set up DKIM
DKIM signs your mail so receivers can trust it. How DKIM works
- 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
- On the DNS Records page, select Add record.
- Choose CNAME as the Type.
- Fill in Name and Target.
- Set Proxy status to DNS only (grey cloud).
- Select Save.
- Repeat for each CNAME record above.
Add the DMARC record (recommended)
DMARC tells receivers what to do with mail that fakes your domain. How DMARC works
- Type
- TXT
- Name
-
_dmarc - Content
-
v=DMARC1; p=none;
In Cloudflare
- On the DNS Records page, select Add record.
- Choose TXT as the Type.
- Fill in Name and Content.
- 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.
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.
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. Sending servers pick an MX record by its priority (lowest number first) and fall back to the others, so a leftover MX record can receive some or all of your mail. 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.
How long until Fastmail works on Cloudflare?
Cloudflare says changes to your DNS records take effect worldwide within 5 minutes, usually much less. A record you replaced can stay cached until its old TTL runs out.
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.
Cloudflare steps and tips
Some of these are other email providers' official guides for Cloudflare. They describe the same Cloudflare dashboard.
- Cloudflare DNS: TXT, CNAME, MX Records (Zoho Mail Help)
- Connect your DNS records at Cloudflare to Microsoft 365 (Microsoft Learn)
- Create zone apex record (Cloudflare Docs)
- Email Routing: domain configuration (Cloudflare Docs)
- FAQ (Cloudflare DNS Docs)
- Manage DNS records (Cloudflare Docs)
- Proxy status (Cloudflare Docs)
Fastmail on other hosts
- Fastmail on Amazon Route 53
- Fastmail on Bluehost
- Fastmail on DreamHost
- Fastmail on GoDaddy
- Fastmail on Hostinger
- Fastmail on IONOS
- Fastmail on Name.com
- Fastmail on Namecheap
- Fastmail on Network Solutions
- Fastmail on OVHcloud
- Fastmail on Porkbun
- Fastmail on SiteGround
- Fastmail on Squarespace Domains
- Fastmail on Wix
- Fastmail on WordPress.com
Other email providers on Cloudflare
- Cloudflare Email Routing on Cloudflare
- Google Workspace on Cloudflare
- Microsoft 365 on Cloudflare
- Zoho Mail on Cloudflare
- Hostinger Email on Cloudflare
- iCloud+ Custom Email Domain on Cloudflare
- Migadu on Cloudflare
- Namecheap Private Email on Cloudflare
- Proton Mail on Cloudflare
- Rackspace Email on Cloudflare
- Titan Email on Cloudflare