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Connecting or disconnecting a domain to/from an IP address

In Sendigram, each sending domain must be associated with an IP address. This link determines which server your emails are sent from and plays a key role in deliverability and sender reputation. You can connect your domain to either a shared IP or a dedicated IP, and later disconnect it if needed.

1. Why Domains Need IP Connections

  • An IP address is the technical "source" of your emails.
  • Connecting your domain to an IP ensures:
    • Proper authentication (SPF, DKIM, DMARC).
    • Better inbox placement through consistent sender identity.
    • The ability to track and manage your sending reputation.

2. Connecting a Domain to an IP

  • Log in to your Sendigram account.
  • Go to Go to Sender Settings.
  • Select the domain you want to connect.
  • Choose Assign IP (shared or dedicated).
  • If you have a dedicated IP, select it from the list; otherwise, the system will assign a shared IP automatically.
  • Save changes.

After connecting, verify that DNS records (SPF, DKIM, DMARC) are correctly configured for your domain.

3. Disconnecting a Domain from an IP

If a domain is no longer in use:

  • Go to Go to Sender Settings.
  • Find the domain you want to disconnect.
  • Click Disconnect from IP.
  • Confirm your choice.
  • The domain will no longer send emails until it is reconnected to an IP.
  • Any active campaigns linked to this domain must be updated with a new sender domain before sending.

4. Best Practices

  • Always keep at least one verified domain connected to an IP before running campaigns.
  • Use subdomains (e.g., mail.yourcompany.com) for marketing emails to protect your root domain's reputation.
  • If switching from shared to dedicated IP, plan for a warming-up period to build reputation gradually.
  • Disconnect domains that are no longer relevant to keep your account organized.

5. Troubleshooting

  • If you cannot connect a domain, check whether it is already assigned to another IP.
  • If DNS records are missing or incorrect, verification will fail.
  • Contact Sendigram Support if your dedicated IP does not appear in the list.
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