Guide to Connect Existing Domains

InboxKit allows you to easily connect domains you already own from any registrar such as Namecheap, GoDaddy, Porkbun, Hostinger, IONOS, Dynadot, or others. Once connected, InboxKit will automatically configure all DNS records (SPF, DKIM, DMARC, MX) on your behalf.

This guide walks you through the entire process:
Connect → Update Nameservers → Verify → Activate

How to Connect Your Existing Domains to InboxKit

You can connect your domains one-by-one OR upload up to 250 domains via CSV. Once added, InboxKit will generate nameservers that you must update in your domain registrar.

Step 1: Go to Domains → Connect Existing

Inside InboxKit:

1. Go to Domains in the sidebar

2. Click Connect Existing

You’ll see two options at the top-right:

• Connect Existing

• Buy Domain

Click Connect Existing to proceed.

Step 2: Add Your Domains

You can add existing domains using:

Option A: Manual Entry (One by One)

• Type your domain into the field

• Press Enter

• Repeat for multiple domains

• Click Connect

Option B: Paste List (Multiple Domains at Once)

• Paste 2–50 domains at a time

• Each must be on a new line

• Click Connect

Option C: Bulk Upload via CSV (Up to 250 Domains)

• Click Upload CSV File

• Upload a file containing up to 250 domain names

• Click Connect

Note: InboxKit allows a maximum of 250 non-connected domains at once.
You can re-add removed domains any time.

Step 3: Get Nameservers Generated by InboxKit

Once you click Connect, InboxKit will generate two nameservers for each domain, for example:

ns1.inboxkit-dns.com  
ns2.inboxkit-dns.com

These nameservers are unique to InboxKit’s DNS automation system.
You MUST update these in your registrar within 12 hours, otherwise the domain will auto-expire and must be re-added.

Step 4: Update Nameservers in Your Domain Registrar

Go to the domain provider where your domain was purchased (e.g., Namecheap, GoDaddy, etc.).

Replace the existing nameservers with the two provided by InboxKit.

Example:

Old nameservers (to delete):

• dns1.registrar.com

• dns2.registrar.com

InboxKit nameservers (to add):

• ns1.inboxkit-dns.com

• ns2.inboxkit-dns.com

Click Save or Update in your registrar.

Propagation Time:
It may take 24–48 hours for nameserver changes to propagate fully.

Step 5: (Optional) Enable Auto-Sync Nameservers

InboxKit lets you directly connect your domain registrar so nameservers can sync automatically.

To use auto-sync:

1. Click Enable Auto-sync

2. Sign in with your registrar credentials (supports major registrars)

3. InboxKit will automatically update nameservers when new domains are added

This is ideal for:

• Agencies

• High-volume senders

• Users managing dozens or hundreds of domains

Step 6: Verify Domain Status (Propagation Check)

Once nameservers are updated:

1. Scroll to the Connected Domains section

2. Find your domain

3. Click Check

Statuses include:

• Not Connected → Nameservers not yet updated

• Checking → Verification in progress

• Active → Nameservers successfully propagated

Only Active domains can be used for mailbox creation.

Step 7: Domain Becomes Active → Ready for Mailboxes

Once your domain reaches Active status:

• SPF, DKIM, DMARC, MX will be automatically configured by InboxKit post mailbox creation

• No additional manual setup is required

• You can immediately start creating Google Workspace or Microsoft 365 mailboxes

Important Notes

• Nameservers must be updated within 12 hours of connecting the domain

• InboxKit automatically configures DNS once domain becomes Active post mailbox setup

• You may re-add expired domains anytime to regenerate nameservers

• You can bulk-check statuses using Bulk Sync → Select All Not Connected

You're All Set!

Your existing domains are now connected to InboxKit.
Once they turn Active, they are fully ready for mailbox creation, warm-up, and sequencer export.