The SendGrid playbook

SendGrid sends the mail. Your domain still has to earn the inbox.

SendGrid can warm a dedicated IP for you automatically, but its warmup docs deal with IP reputation, not with a new sending domain. Keep your campaigns and API sends exactly where they are. Add your brand domain here and we build its reputation while SendGrid keeps sending.

Start warming my domainSee Inbox Boost
The SendGrid playbook

Keep sending from SendGrid. Warm the domain here.

Step 1

Authenticate your domain in SendGrid

SendGrid calls domain authentication a fundamental step. Until you do it, mail shows “via sendgrid.net” after your From address. With automated security on, SendGrid generates CNAME records for DKIM and the return path, plus a DMARC record. Subdomains do not inherit authentication, so each sending domain needs its own records.

Step 2

Know what SendGrid warms, and what it does not

On a dedicated IP, automated warmup caps the traffic through the new IP and sends the overflow over your other warm IPs. On Free and Essentials plans you share pools that SendGrid groups by engagement. The warmup docs address IP reputation only; a new sending domain is not part of it.

Step 3

Add your brand domain to Inbox Boost

Use the domain in your From address, such as yourbrand.com. The return-path subdomain SendGrid sets up on it stays with SendGrid. We set up what the domain needs and build its sender reputation for you. Nothing to connect to SendGrid: no API key, no app, no change to your account.

Step 4

Keep every campaign and API send running in SendGrid

Marketing Campaigns, API and SMTP mail: all of it stays in SendGrid. Mailbox providers score the domain in your From address, so the reputation built here counts for every SendGrid send from yourbrand.com.

Step 5

Check where SendGrid mail lands

Inbox placement tests show whether your mail reaches Primary, Promotions or Spam across the major mailbox providers, and blacklist monitoring keeps watching the domain once it is warm.

  • Nothing to connect: no SendGrid API key, app or integration
  • Nothing to change: API calls, SMTP settings and campaigns stay exactly as they are
  • Shared or dedicated IP: it works either way, because the reputation belongs to the domain
  • Watched after warmup: blacklist and authentication monitoring on your brand domain
Features SendGrid senders lean on

The parts of the platform this plan leans on.

Feature

Inbox Boost

Add a domain. We provision the sending server and publish your DNS.

Learn more Feature

Guided DNS setup

We write SPF, DKIM and return-path into your zone, not you.

Learn more Feature

Inbox placement testing

See whether you land in Primary, Promotions or Spam across providers.

Learn more
See it play out

A SendGrid domain, warmed without pausing a single send.

Four checkpoints, in order. Click any step or let it play.

sendgrid · yourbrand.com
DKIM (s1, s2)verified
return pathon your domain
sending historynone yet
Questions

SendGrid questions, answered.

Does Inbox Boost connect to my SendGrid account?
No. There is no API key, app or integration to install. Inbox Boost works on your brand domain, and SendGrid keeps sending your campaigns and API mail exactly as it does now.
SendGrid already warms dedicated IPs. Why warm the domain too?
SendGrid’s automated warmup moves traffic onto a new dedicated IP, and its warmup pages are about IP reputation. Your sending domain carries its own reputation with Gmail, Outlook and Yahoo, and nothing in that warmup builds it. Twilio itself notes that warmup does not guarantee a good reputation.
I am on a SendGrid shared pool. Does this still help?
Yes. SendGrid groups shared pools by engagement and the IPs can change without notice, so the domain is the reputation that is actually yours. Building it here helps everything SendGrid sends from it.
Do I need domain authentication in SendGrid first?
We recommend it. Without it, mail carries “via sendgrid.net” and the reputation your mail earns is not tied to your brand. Authenticate the domain in SendGrid, then add your brand domain, the one in your From address, here.
Can I see whether it is working?
Yes. Inbox placement tests show where your SendGrid mail lands, Primary, Promotions or Spam, across the major mailbox providers, and blacklist monitoring keeps watching the domain afterwards.
About the SendGrid facts on this page

Checked against SendGrid's own documentation on 12 October 2026. SendGrid is a trademark of its owner; SenderSignal is not affiliated with it.

Other marketing platforms: Klaviyo, Mailchimp, Constant Contact, Brevo, ActiveCampaign, MailerLite. All use cases.

SendGrid keeps sending

Warm the domain behind your SendGrid mail.

Start free, add your brand domain, and keep every send running through SendGrid while its reputation builds.

Start freeHow Inbox Boost works