Email Setup Wizard

Microsoft 365 + Squarespace Domains

Set up Microsoft 365 email on Squarespace Domains

The records Microsoft 365 needs, written with the field names Squarespace Domains uses (Name, Mail Server, Text, Data), in the order to add them.

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

Before you start

  1. Have your Microsoft 365 account ready. Some values are unique to your account and come from the Microsoft 365 admin center.
  2. Open DNS at Squarespace Domains: Open the domains dashboard (account.squarespace.com/domains). Click your domain. Click DNS, then DNS Settings.
  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 Microsoft 365 admin center” are unique to your account.

Domain verification Proves you own the domain Type TXT Name @ Value Copy from Microsoft 365 admin center Looks like: MS=ms followed by digits Priority n/a TTL 3600 (1 h)
MX records Where incoming email goes Type MX Name @ Value Copy from Microsoft 365 admin center Looks like: <your MX token>.mail.protection.outlook.com, or for domains set up on Microsoft's newer DNSSEC infrastructure <your MX token>.<subdomain>.mx.microsoft Priority 0 TTL 3600 (1 h)
SPF record Which servers may send as you Type TXT Name @ Value v=spf1 include:spf.protection.outlook.com -all Priority n/a TTL 3600 (1 h)
DKIM A signature on every message · recommended Type CNAME Name selector1._domainkey Value Copy from Microsoft 365 admin center Looks like: selector1-yourdomain-com._domainkey.<your onmicrosoft prefix>.<letter>-v1.dkim.mail.microsoft (older domains: selector1-yourdomain-com._domainkey.<prefix>.onmicrosoft.com) Priority n/a TTL 3600 (1 h)
DKIM A signature on every message · recommended Type CNAME Name selector2._domainkey Value Copy from Microsoft 365 admin center Looks like: selector2-yourdomain-com._domainkey.<your onmicrosoft prefix>.<letter>-v1.dkim.mail.microsoft (older domains: selector2-yourdomain-com._domainkey.<prefix>.onmicrosoft.com) Priority n/a TTL 3600 (1 h)
DMARC record What to do with fakes · recommended Type TXT Name _dmarc Value v=DMARC1; p=none; pct=100; rua=mailto:dmarc@yourdomain.com Priority n/a TTL 4 hours
Autodiscover Automatic app setup · recommended Type CNAME Name autodiscover Value autodiscover.outlook.com Priority n/a TTL 3600 (1 h)

Step by step in Squarespace Domains

Verify your domain

Your email provider needs proof that you control this domain before it accepts email for it.

Type
TXT
Name
@
Text
Copy it from Microsoft 365 admin center (see below)

Where to find your value

In the Microsoft 365 admin center go to Settings > Domains and add your domain (or select it and choose Start setup). On Verify you own your domain, choose Add a TXT record to the domain's DNS records and copy the TXT value.

It looks like: MS=ms followed by digits

  • This record only proves you own the domain. It doesn't affect anything else and can be deleted after verification.
  • Verification usually takes up to 10 minutes after adding the record, sometimes up to 48 hours.

In Squarespace Domains

  1. Scroll to Custom Records and click Add record.
  2. Re-enter your password (or confirm with two-factor authentication) if asked, then click Continue.
  3. Set Type to TXT, then fill in Name and Text.
  4. Click Save.

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
0
Mail Server
Copy it from Microsoft 365 admin center (see below)

Where to find your value

In the Microsoft 365 admin center go to Settings > Domains, select your domain, then DNS records > Manage DNS. On the Add DNS records page, expand MX Records and copy the value.

It looks like: <your MX token>.mail.protection.outlook.com, or for domains set up on Microsoft's newer DNSSEC infrastructure <your MX token>.<subdomain>.mx.microsoft

  • Use the highest priority your host allows, typically 0.
  • Remove MX records that point to your previous email provider, or give them a lower priority (a higher number) than the Microsoft 365 record.
  • Add users and mailboxes in Microsoft 365 before switching the MX record so incoming mail keeps flowing.
  • Exchange Online only supports TTL values under 6 hours (21,600 seconds).

In Squarespace Domains

  1. Click Add record.
  2. Re-enter your password (or confirm with two-factor authentication) if asked, then click Continue.
  3. Set Type to MX, then fill in Name, Priority and Mail Server.
  4. Click Save. Add one record per mail server, each with its own priority.

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
@
Text
v=spf1 include:spf.protection.outlook.com -all
  • If an SPF record already exists, don't create a second one. Add include:spf.protection.outlook.com to the existing record so there is a single SPF record.
  • Microsoft recommends -all (hard fail) together with DKIM and DMARC.
  • Only one SPF record is allowed per domain, and it must stay under 10 DNS lookups.

In Squarespace Domains

  1. Scroll to Custom Records and click Add record.
  2. Re-enter your password (or confirm with two-factor authentication) if asked, then click Continue.
  3. Set Type to TXT, then fill in Name and Text.
  4. Click Save.

Set up DKIM (recommended)

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
selector1._domainkey
Data
Copy it from Microsoft 365 admin center (see below)

Where to find your value

In the Microsoft Defender portal open Email authentication settings (security.microsoft.com/authentication), select the DKIM tab and your domain, then copy the two CNAME values. They are also shown in the admin center under Add DNS records > Advanced options > DomainKeys Identified Mail (DKIM).

It looks like: selector1-yourdomain-com._domainkey.<your onmicrosoft prefix>.<letter>-v1.dkim.mail.microsoft (older domains: selector1-yourdomain-com._domainkey.<prefix>.onmicrosoft.com)

  • Microsoft lists DKIM as optional, but DMARC needs DKIM to align with your domain.
  • After both CNAME records resolve, turn on Sign messages for this domain with DKIM signatures in the Defender portal.
Type
CNAME
Name
selector2._domainkey
Data
Copy it from Microsoft 365 admin center (see below)

Where to find your value

Same place as selector1: Defender portal > Email authentication settings > DKIM tab > your domain.

It looks like: selector2-yourdomain-com._domainkey.<your onmicrosoft prefix>.<letter>-v1.dkim.mail.microsoft (older domains: selector2-yourdomain-com._domainkey.<prefix>.onmicrosoft.com)

  • Add both selector records. Microsoft rotates between them.

In Squarespace Domains

  1. Scroll to Custom Records and click Add record.
  2. Re-enter your password (or confirm with two-factor authentication) if asked, then click Continue.
  3. Set Type to CNAME, then fill in Name and Data.
  4. Click Save.
  5. 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
Text
v=DMARC1; p=none; pct=100; rua=mailto:dmarc@yourdomain.com
  • Start with p=none and read the reports, then move to p=quarantine and finally p=reject. pct can step up in stages (10, 25, 50, 75, 100).
  • Replace the report address with a shared mailbox or group, not a personal inbox.
  • Set up SPF and DKIM first.
  • Microsoft 365 doesn't send forensic (ruf) reports.

In Squarespace Domains

  1. Scroll to Custom Records and click Add record.
  2. Re-enter your password (or confirm with two-factor authentication) if asked, then click Continue.
  3. Set Type to TXT, then fill in Name and Text.
  4. Click Save.

Add the Autodiscover record (recommended)

Autodiscover lets Outlook and other mail apps find your account settings without manual setup.

Type
CNAME
Name
autodiscover
Data
autodiscover.outlook.com
  • Optional but highly recommended: lets Outlook and other apps set up mailboxes automatically.

In Squarespace Domains

  1. Scroll to Custom Records and click Add record.
  2. Re-enter your password (or confirm with two-factor authentication) if asked, then click Continue.
  3. Set Type to CNAME, then fill in Name and Data.
  4. Click 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 Squarespace Domains’s words.

We only read public DNS records. Nothing is stored.

Common mistakes with Microsoft 365 on Squarespace Domains

Switching MX before adding mailboxes

Add users and mailboxes in Microsoft 365 before changing the MX record, or incoming mail has nowhere to go.

Adding a second SPF record

Microsoft says not to create a new SPF record if one exists. Add include:spf.protection.outlook.com to the existing record so there is a single SPF record.

Publishing DKIM CNAMEs but not turning on signing

After both selector CNAMEs resolve, switch on Sign messages for this domain with DKIM signatures in the Defender portal.

Using a TTL longer than 6 hours on MX

Exchange Online only supports TTL values under 6 hours (21,600 seconds). One hour (3600) is the recommended value.

Squarespace Domains: Change your Squarespace login first

If you sign in to Squarespace with an address at this domain, change your account email before deleting MX records, or you could lock yourself out.

Squarespace Domains: SPF entries are merged for you

Each SPF value added as its own custom record is merged into one SPF record. Refresh the page to see the merged result. If you get a Custom records not saved error, delete the existing SPF records and add them again.

Squarespace Domains: Only one DMARC record

A domain can have only one DMARC record. Email forwarding rules add one automatically, so merge into it rather than adding a second.

Visit Microsoft 365 Visit Squarespace Domains

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Tell us your domain and we will add and verify every record for Microsoft 365 on Squarespace Domains, then send you the check results.

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Microsoft 365 on Squarespace Domains: questions

Where do I add Microsoft 365 DNS records in Squarespace Domains?

Open the domains dashboard (account.squarespace.com/domains). Click your domain. Click DNS, then DNS Settings. Add each record there, one at a time.

What goes in the Name field at Squarespace Domains?

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

Do I need to delete my existing MX records at Squarespace Domains?

Remove MX records that point to your previous email provider, or give them a lower priority (a higher number) than the Microsoft 365 record. If you sign in to Squarespace with an address at this domain, change your account email before deleting MX records, or you could lock yourself out.

Where do I get my Microsoft 365 DKIM record?

In the Microsoft Defender portal open Email authentication settings (security.microsoft.com/authentication), select the DKIM tab and your domain, then copy the two CNAME values. They are also shown in the admin center under Add DNS records > Advanced options > DomainKeys Identified Mail (DKIM).

How long until Microsoft 365 email works on Squarespace Domains?

DNS changes typically take about 15 minutes to take effect, occasionally longer. Squarespace says DNS changes can take 24 to 48 hours to update.

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.

Microsoft 365 on other hosts

Other email providers on Squarespace Domains