Squarespace Domains DNS setup

Follow these steps

1. 1Open DNS Settings and find the "Custom records" section.
2. 2If the domain has Squarespace email switched on, switch it off first. It adds its own MX records.
3. 3Add the MX, SPF and DKIM CNAME records from the table below. DMARC is optional.
4. 4Back in mailsi, press "Check".

Records to add

These records follow the same rules as the setup wizard in the app. MX is required. SPF, DKIM and DMARC are recommended. After you add the domain, mailsi shows your own MX value.

• Type

  MX

  Host

  @

  Value

  <your-unique-host>.mx.mailsi.dev

  Priority

  10

  Purpose

  Inbound MX. This record alone proves you own the domain.

• Type

  TXTrecommended

  Host

  @

  Value

  v=spf1 include:spf.mailsi.dev ~all

  Purpose

  SPF: include spf.mailsi.dev so replies land in the inbox more often.

• Type

  CNAMErecommended

  Host

  mailsi1._domainkey

  Value

  mailsi1._domainkey.mailsi.dev

  Purpose

  DKIM CNAME: on Cloudflare set it to DNS only (grey cloud).

• Type

  TXTrecommended

  Host

  _dmarc

  Value

  v=DMARC1; p=none

  Purpose

  DMARC: no policy exists yet; start with p=none to monitor.

<your-unique-host>.mx.mailsi.dev is a placeholder. Your real value is unique and appears in mailsi after you add the domain.

Common mistakes

• Remove old MX records. If the domain pointed at another mail service, leftover MX records can send mail there.
• Only one SPF record is allowed. If you already have a v=spf1 TXT record, add include:spf.mailsi.dev to it instead of creating a second record.
• Keep the DKIM CNAME as DNS only (grey cloud) if your provider is Cloudflare.
• The default TTL from your provider is fine, for example 300 seconds or one hour.
• DNS changes can take minutes to hours. mailsi checks automatically and shows the result in the app.
• One-click setup (Domain Connect) is not available yet, so add the records by hand.