RelayMailPricing

Forward email to Slack / Squarespace

Forward a Squarespace domain address (support@) to a Slack channel

If your domain is registered with Squarespace, its Email Forwarding can send support@ to another address without any mailbox. Point the rule at your RelayMail address, click the verification link, and once forwarding starts each email becomes a Slack thread. Replies from the thread go back to the customer as email.

Steps

  1. 1

    Check the domain

    This is for domains managed by Squarespace. A domain registered elsewhere uses that provider's forwarding instead, and Squarespace forwarding isn't available for internationalized domain names.

  2. 2

    Remove an old DMARC record first

    If the domain already has a DMARC record, delete it before you start. Squarespace adds its own records for forwarding, and a conflicting DMARC record makes setup fail.

  3. 3

    Add a forwarding rule

    In the domains dashboard open the domain, click Email, scroll to Email Forwarding and click Add rule. Enter support in Forward from and the forwarding address from your RelayMail setup page (inbox-...@relay.relaymail.app) in Forward to, then save.

  4. 4

    Verify, then wait

    Squarespace sends a verification email to the Forward to address. Until forwarding is confirmed, RelayMail passes that email on to the email on your Slack account: open it there and click the link. Squarespace says forwarding begins 24 to 48 hours after you verify.

  5. 5

    Send a test email

    Once forwarding has started, email support@ from an outside account. When it arrives, RelayMail confirms forwarding by itself and the email appears in the channel as a thread; reply there and the sender gets your reply by email.

Confirming the forward

Squarespace sends a verification link to the Forward to address. RelayMail passes it on to the email on your Slack account until forwarding is confirmed. Forwarding begins 24 to 48 hours after you click it. Replies you write in the Slack thread go out from noreply@relay.relaymail.app with Reply-To set to your support address, so the customer's answer comes back through the same forward into the same thread. To send replies as support@ itself, verify your domain in RelayMail (see the custom domain guide); that adds sending records for RelayMail and does not change where your inbound mail goes.

What to watch for

  • Each alias forwards to one address only, so support@ cannot also go to a second inbox. With RelayMail as the destination, Slack is where support@ mail lands.
  • Squarespace adds MX and TXT records for forwarding (it uses Mailgun). Removing them breaks every forwarding rule on the domain.
  • A rule with * in Forward from sends every alias on the domain to the same address. Use support for just that address.
  • Plus addressing (support+tag@) is not available with Squarespace forwarding.

Questions

How long does Squarespace email forwarding take to start?

Squarespace says forwarding begins 24 to 48 hours after you verify the destination address.

Can Squarespace forward support@ to Slack and to Gmail?

Not with two rules: Squarespace allows one Forward to address per alias. Point it at RelayMail and the team works the mail from Slack.

Answer Squarespace email from the Slack thread

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Updated 2026-11-07. How we check these pages. Sources: Squarespace: Email forwarding with a Squarespace domain.

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