Mailboxes for Instantly
Instantly Mailboxes: Add, Warm Up & Scale
To add email accounts to Instantly, connect Google or Microsoft mailboxes from the Email Accounts tab by OAuth. Jetmail builds those mailboxes, with domains and DNS, and connects them to Instantly in one click.
- [email protected]Google · SPF, DKIM, DMARC ✓ Connected
- [email protected]Google · SPF, DKIM, DMARC ✓ Connected
- [email protected]Microsoft · SPF, DKIM, DMARC ✓ Connected
- [email protected]Microsoft · SPF, DKIM, DMARC ✓ Connected
Warmup switches on inside Instantly after connecting.
Setup
How to add mailboxes to Instantly
Instantly mailboxes can come from two places: accounts you buy inside Instantly, or Google Workspace and Microsoft 365 mailboxes you bring yourself. Bringing your own takes five steps with Jetmail.
Step 1
Buy domains
Lookalike domains, registered to you, in the Jetmail dashboard.
Step 2
Create mailboxes
About 3 Google or Microsoft mailboxes per domain.
Step 3
Auto DNS
SPF, DKIM, DMARC and MX published for you.
Step 4
1-click OAuth
Connect every mailbox to Instantly at once.
Step 5
Warm up & send
Warm up, or start pre-warmed at about 30/day.
| Method | What you do in Instantly | What has to be ready first |
|---|---|---|
| Google, OAuth | Connect existing accounts → Google → Option 1: oAuth → Login | A Workspace admin adds Instantly as a trusted app under Security → Access and data control → API controls |
| Google, app password | Connect existing accounts → Google → app password option | 2-Step Verification on for each account (Google prefers OAuth) |
| Microsoft 365 / Outlook | Connect existing accounts → Office 365 / Outlook → sign in | SMTP and IMAP enabled in the Microsoft admin center |
| Jetmail mailboxes | Nothing: connect from Jetmail with 1-click OAuth | Nothing: DNS and mailbox settings are done for you |
Instantly login
Log in to Instantly and add your accounts
The Instantly login page is app.instantly.ai. Once you're signed in, adding an account takes a few clicks.
- Go to app.instantly.ai and sign in with your Instantly email and password.
- Open the Email Accounts tab and click Add or Buy Accounts.
- Choose Connect existing accounts, then Google or Office 365 / Outlook.
- Sign in to the mailbox in the pop-up and accept the permissions. If an account isn't listed, pick "Use another account".
- Repeat for each mailbox, then open each account's settings and switch warmup on.
With dozens of mailboxes, steps 3–5 are where the time goes. Jetmail connects all of them by OAuth from one screen, the same way it does for Smartlead and 50+ other tools.
Instantly domains
Instantly DFY accounts vs your own mailboxes
Instantly sells done-for-you and pre-warmed Google accounts. Here's how they compare with bringing your own through Jetmail, using each provider's published terms (October 2026).
| Instantly DFY | Jetmail | |
|---|---|---|
| Google mailboxes | $5/mailbox (done-for-you) | $39/mo for 10 · $99/mo for 30 · $299/mo for 100 (extra $3.50–$3.00) |
| Microsoft mailboxes | Not offered | Same price as Google |
| Pre-warmed | $10/mailbox, Google only, batches of 5 | Google & Microsoft: $39 for 3 · $149 for 12 · $339 for 30 first month, then $6–$8/mailbox |
| Domains | $15/yr; Instantly keeps ownership and won't transfer | Bring your own or buy in the dashboard; registered to you |
| Minimum | Paid Instantly plan required (from $47/mo) | 10 mailboxes (Starter) |
| Where they work | Built into Instantly; needs a paid Instantly plan | 50+ (Instantly, Smartlead, …) |
Monthly cost of 30 mailboxes
Mailboxes only, billed monthly, domains excluded. Jetmail pre-warmed is shown at its price after the first month. Instantly accounts also need a paid Instantly sending plan (from $47/mo), not included above.
| Instantly DFY | $150 |
|---|---|
| Jetmail | $99 |
| Instantly pre-warmed | $300 |
| Jetmail pre-warmed | $180 |
What is a forwarding domain in Instantly?
In Instantly's done-for-you setup, the forwarding domain is an optional field where you enter your main website's domain. Anyone who types one of your secondary sending domains into a browser is redirected to your real site. It doesn't touch email: replies still land in the mailbox that sent the message. Instantly's DFY setup supports .com and .org domains only and creates up to 5 accounts per domain. With Jetmail, domains are registered to you at $15/year each, so you can set up the same website redirect at your DNS host and keep the domains if you change tools. More on picking them in cold email domains.
Instantly email warmup
Instantly warmup settings, explained
Turning on warmup adds a mailbox to Instantly's pool of warmup accounts, which send to each other, open, reply and pull messages out of spam. These are the settings Instantly pre-fills for a new account.
| Setting | What it does | Instantly's suggestion |
|---|---|---|
| Increase per day | Adds warmup emails one day at a time | 1 |
| Daily warmup limit | Most warmup emails sent per day | 10 for new accounts |
| Reply rate % | Share of warmup emails that get a reply | 30 for new accounts |
| Disable slow warmup | Skips the gradual ramp | Only for accounts that are already warm |
| Warmup filter tag | Keeps warmup emails out of your main inbox | Default or random tag |
| Weekdays only mode | Sends warmup emails Monday to Friday | Optional |
Instantly asks you to wait at least 2 weeks, with a warmup health score above 90%, before a new account sends campaigns. Leave warmup running at a low level afterwards. The full week-by-week schedule is in the email warmup guide.
Instantly pre-warmed accounts, without the lock-in
Checklist
Before your first Instantly campaign
- Send from lookalike domains, never your main company domain.
- Keep about 3 mailboxes per domain and about 30 cold emails per mailbox per day.
- Check SPF and DMARC pass with the SPF checker and DMARC checker.
- Warm up new mailboxes for at least 2 weeks, or start with pre-warmed ones.
- Set a custom tracking domain in Instantly if you track links.
Need the full stack? See cold email infrastructure or compare plans on the pricing page.
Sources: Instantly pricing · Instantly: connect Google via OAuth · Instantly: connect Google via app password · Instantly: connect Microsoft 365 · Instantly: DFY email setup · Instantly: pre-warmed accounts · Instantly: how warmup works · Instantly: warmup settings
Get a free Instantly mailbox plan
Tell us where to send it. We'll reply with mailbox, domain and DNS recommendations for your sending volume — or start right away and have mailboxes live in minutes.
Where should we send it?
Or see pricing →Frequently asked questions
How do I add email accounts to Instantly?
In Instantly, open Email Accounts, click Add or Buy Accounts, choose Connect existing accounts and pick Google or Office 365 / Outlook. Google accounts connect by OAuth (after a Workspace admin trusts Instantly's app) or with an app password; Microsoft accounts connect by signing in once SMTP and IMAP are enabled.
What is a forwarding domain in Instantly?
It's an optional field in Instantly's done-for-you domain setup. You enter your main website's domain, and anyone who visits one of your secondary sending domains is redirected there. It only affects website visitors; it doesn't forward email or change where replies go.
Does Instantly include email warmup?
Yes. As of October 2026, every Instantly plan includes automated warmup, and the Growth plan lists unlimited email accounts and warmup. Instantly recommends waiting at least 2 weeks, with a warmup health score above 90%, before using a new account in campaigns.
What are Instantly pre-warmed accounts?
Google accounts Instantly has already warmed, sold at $10 per account per month in batches of 5, plus $15 per domain per year. Instantly keeps ownership of the domains and the accounts only work inside Instantly.
How do I log in to Instantly?
Go to app.instantly.ai and sign in with your Instantly account. Your mailboxes are connected from the Email Accounts tab once you're in. If you use Jetmail, you never share mailbox passwords with Instantly: the connection is made by OAuth.
Can I use my own Google and Microsoft mailboxes in Instantly?
Yes. Jetmail creates Google Workspace and Microsoft 365 mailboxes on domains registered to you, publishes SPF, DKIM, DMARC and MX, and connects them to Instantly with 1-click OAuth. Because you own the domains, you can move the same mailboxes to another sending tool later.