The Instantly playbook

Instantly runs the sequences. Your domain still has to earn the inbox.

Instantly sends through the Google Workspace, Microsoft 365 or IMAP and SMTP mailboxes you connect, and warms each one inside its warmup pool. The domain those mailboxes share carries a reputation of its own. Keep every campaign where it is. Add the domain here and we build its reputation while Instantly keeps sending.

Start warming my domainSee Inbox Boost
The Instantly playbook

Keep sending from Instantly. Warm the domain here.

Step 1

Connect and authenticate your mailboxes

Instantly sends through the accounts you connect, and every account needs IMAP as well as SMTP. SPF and DKIM come from your mailbox provider, not from Instantly, and Instantly tells you to confirm MX, SPF, DKIM and DMARC with Test Domain Setup before warmup and campaigns.

Step 2

Know what Instantly’s warmup measures

Warmup adds each account to a pool of other Instantly users with warmup enabled, where warmup emails are sent, opened and replied to. The health score counts where those warmup emails land, not where your campaign emails land, and missing DNS records can get warmup switched off for that account.

Step 3

Add your sending domain to Inbox Boost

Add the domain your mailboxes send as, the one in your From address, such as outreach.yourbrand.com, and we build its sender reputation for you, alongside whatever warmup you run in Instantly. Nothing to connect: no API key, no app, no mailbox sign-in, no change to your Instantly account.

Step 4

Keep every campaign running in Instantly

Sequences, follow-ups and every connected account stay in Instantly, at the volume Instantly recommends, about 30 campaign emails per account per day. Mailbox providers score the domain in your From address, so the reputation built here counts for every mailbox sending as outreach.yourbrand.com.

Step 5

Check where Instantly mail lands

Inbox placement tests show whether your campaign emails reach Primary, Promotions or Spam across the major mailbox providers, which the warmup health score does not tell you. Blacklist monitoring keeps watching the domain once it is warm.

  • Nothing to connect: no Instantly API key, app, integration or mailbox sign-in
  • Nothing to change: campaigns, accounts and warmup settings stay exactly as they are
  • Every mailbox on the domain: the reputation belongs to the domain, so it counts for each account sending from it
  • Watched after warmup: blacklist and authentication monitoring on your sending domain
Features Instantly 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

Inbox placement testing

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

Learn more Feature

Blacklist monitoring

45+ blacklist & reputation sources, scored 0-100 with trend history.

Learn more
See it play out

A Instantly domain, warmed without pausing a single send.

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

instantly · outreach.yourbrand.com
SPF, DKIMpass
DMARCpublished
domain historynone yet
Questions

Instantly questions, answered.

Does Inbox Boost connect to my Instantly account or mailboxes?
No. There is no API key, app or integration to install, and nothing signs in to your Google or Microsoft mailboxes. Inbox Boost works on the sending domain, and Instantly keeps sending your campaigns exactly as it does now.
Instantly already warms my accounts. Why warm the domain too?
Instantly’s warmup works account by account: each mailbox exchanges warmup emails with other Instantly users in the pool. Mailbox providers also score the domain those accounts share, and Inbox Boost works on that domain itself, alongside whatever Instantly does. Your warmup settings can stay as they are.
Does Inbox Boost need access to my Google Workspace mailboxes?
No. Inbox Boost does not sign in to any mailbox or ask for Gmail permissions. Google’s policy says apps using the Gmail API must not use multiple accounts to bypass Gmail account limits or circumvent spam filters; Inbox Boost stays out of your accounts entirely and works on the sending domain.
What do Gmail and Outlook expect from my domain?
Authentication from your mailbox provider: SPF and DKIM, plus a DMARC record aligned with them. Gmail and Outlook both require all three from bulk senders, and Gmail counts mail from a primary domain and its subdomains together. Instantly’s Test Domain Setup checks the records before you start campaigns.
Can I see whether it is working?
Yes. Inbox placement tests show where your Instantly campaign emails land, Primary, Promotions or Spam, across the major mailbox providers. That is campaign placement, which the warmup health score does not measure. Blacklist monitoring keeps watching the domain afterwards.
About the Instantly facts on this page

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

Other cold outreach: Smartlead, Lemlist, Apollo, Woodpecker, Reply.io. All use cases.

Instantly keeps sending

Warm the domain behind your Instantly sequences.

Start free, add the domain, and keep every campaign running in Instantly while its reputation builds.

Start freeHow Inbox Boost works