Email Setup Wizard

Fastmail + SiteGround

Set up Fastmail email on SiteGround

The records Fastmail needs, written with the field names SiteGround uses (Name, Destination, Value, Resolves to), 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 SiteGround: Open Site Tools for your site. Go to Domain > DNS Zone Editor.
  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 Leave empty Value in1-smtp.messagingengine.com Priority 10 TTL Default
MX records Where incoming email goes Type MX Name Leave empty Value in2-smtp.messagingengine.com Priority 20 TTL Default
SPF record Which servers may send as you Type TXT Name Leave empty Value v=spf1 include:spf.messagingengine.com ?all Priority n/a TTL Default
DKIM A signature on every message Type CNAME Name fm1._domainkey Value fm1.yourdomain.com.dkim.fmhosted.com Priority n/a TTL Default
DKIM A signature on every message Type CNAME Name fm2._domainkey Value fm2.yourdomain.com.dkim.fmhosted.com Priority n/a TTL Default
DKIM A signature on every message Type CNAME Name fm3._domainkey Value fm3.yourdomain.com.dkim.fmhosted.com Priority n/a TTL Default
DMARC record What to do with fakes · recommended Type TXT Name _dmarc Value v=DMARC1; p=none; Priority n/a TTL Default

Step by step in SiteGround

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
Leave this field empty
Priority
10
Destination
in1-smtp.messagingengine.com
Type
MX
Name
Leave this field empty
Priority
20
Destination
in2-smtp.messagingengine.com

In SiteGround

  1. Under Create New Record, open the MX tab and choose Add your own MX records.
  2. Leave Name empty, enter the Priority and the Destination.
  3. Click Create.
  4. Under Manage DNS Records, delete SiteGround's default MX records.
  5. 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
Leave this field empty
Value
v=spf1 include:spf.messagingengine.com ?all
  • This is the exact value from Fastmail's manual DNS guide, which ends in ?all (neutral).

In SiteGround

  1. Under Create New Record, open the TXT tab.
  2. Enter only the prefix in Name (SiteGround adds your domain) and the Value.
  3. Click Create.

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

In SiteGround

  1. Under Create New Record, open the CNAME tab.
  2. Enter only the prefix in Name and the target in Resolves to.
  3. Click Create.
  4. 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
Value
v=DMARC1; p=none;

In SiteGround

  1. Under Create New Record, open the TXT tab.
  2. Enter only the prefix in Name (SiteGround adds your domain) and the Value.
  3. Click Create.

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 SiteGround’s words.

We only read public DNS records. Nothing is stored.

Common mistakes with Fastmail on SiteGround

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.

SiteGround: Delete SiteGround's default MX records

New sites start with three MX records for SiteGround's own mail: mx10, mx20 and mx30.antispam.mailspamprotection.com. Remove them when you use another provider.

SiteGround: SPF lives under Email > Authentication

SiteGround manages SPF in Site Tools > Email > Authentication. Edit the Include List there instead of adding a second SPF record in the DNS Zone Editor.

Visit Fastmail Visit SiteGround

Rather have someone do it for you?

Tell us your domain and we will add and verify every record for Fastmail on SiteGround, then send you the check results.

Request done-for-you setup

Fastmail on SiteGround: questions

Where do I add Fastmail DNS records in SiteGround?

Open Site Tools for your site. Go to Domain > DNS Zone Editor. Add each record there, one at a time.

What goes in the Name field at SiteGround?

Leave it empty 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. SiteGround adds your domain automatically.

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

Yes. Mail servers deliver to every MX record you publish, so keep only the Fastmail MX records and delete the rest. New sites start with three MX records for SiteGround's own mail: mx10, mx20 and mx30.antispam.mailspamprotection.com. Remove them when you use another provider.

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 SiteGround