# Sending limits and the slow start | GTM and Outreach

Source: https://exntra.in/help/slow-start

[Help center](/help)

Getting started

-   [Start here](/help/start-here)

Mailboxes

-   [Connect a Google Workspace mailbox](/help/connect-google)
-   [Connect Microsoft 365](/help/connect-microsoft)
-   [Connect Zoho Mail](/help/connect-zoho)
-   [Connect any other provider (SMTP and IMAP)](/help/connect-smtp)

Reaching the inbox

-   [Sending limits and the slow start](/help/slow-start)
-   [Why we don't do warm-up](/help/no-warmup)
-   [Set up SPF, DKIM and DMARC](/help/dns-records)
-   [Domain and server checks](/help/domain-health)

Contacts

-   [Import contacts](/help/import-contacts)
-   [How we check contacts](/help/contact-checks)
-   [Email providers (ESP sending and matching)](/help/email-providers)
-   [Your blocklist](/help/blocklist)

Campaigns

-   [Create a campaign](/help/create-campaign)
-   [Write your emails](/help/write-emails)
-   [Schedule and smart scheduling](/help/schedule)
-   [Unsubscribe options](/help/unsubscribe)
-   [Preview, test and review](/help/test-and-review)
-   [Understand your results](/help/campaign-results)
-   [Bounces and auto-pause](/help/bounces)
-   [Pause, edit and restart a campaign](/help/manage-campaign)
-   [1–100 testing](/help/ab-testing)

Inbox and replies

-   [The Master Inbox](/help/master-inbox)
-   [Automatic replies](/help/auto-replies)

Account and team

-   [Team members and roles](/help/team-roles)
-   [Workspaces](/help/workspaces)
-   [HubSpot, Salesforce and moving from other tools](/help/integrations)
-   [API, webhooks and AI agents](/help/api-and-ai)
-   [Plan and billing](/help/billing)
-   [When our support team opens your account](/help/support-access)
-   [Change the app's language](/help/language)
-   [Two-step sign-in](/help/two-step-sign-in)

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# Sending limits and the slow start

How many emails each mailbox sends a day, and why new mailboxes start small.

[Open in the app →](https://app.example.com/#/mailboxes)

Every mailbox has a **daily limit**. It counts all emails: first emails and follow-ups.

## The slow start

A new mailbox starts small and grows:

| Week | Emails a day |
| --- | --- |
| Week 1 | 10 |
| Week 2 | 20 |
| Week 3 | 30 |

After three weeks, the mailbox uses its full daily limit. The mailbox card shows the day you’re on, for example “Slow start, day 5 of 21”.

Google and Microsoft trust new senders slowly. A slow start keeps your domain safe.

**Already using this mailbox for a long time?** You can turn the slow start off. Open the mailbox’s **Settings** and untick **Slow start**.

## Daily limits

-   Default: **30 a day**. Zoho: **25 a day**.
-   Google and Microsoft mailboxes usually stay safe under **30 to 50 a day**.
-   Need more? Add more mailboxes rather than pushing one mailbox hard.

Change the limit in the mailbox’s **Settings**. A campaign also has its own limit for each mailbox it uses. A mailbox never sends more than its own daily limit in total, across all campaigns.

## New domains

A domain younger than **30 days** stays at **10 emails a day**, even with the slow start off. New domains are distrusted. The mailbox card shows “New domain”.

## When a provider asks us to slow down

Sometimes Gmail, Microsoft or another provider replies “too many emails, try later”. We pause that mailbox:

-   Google and Microsoft: for **24 hours**.
-   Other providers: for **1 hour**.

Sending starts again on its own. The mailbox card shows when.

## Bounce limits

Each campaign pauses itself when its bounce rate reaches its limit (default **5%**). See [Bounces and auto-pause](/help/bounces).

[Previous**Connect any other provider (SMTP and IMAP)**](/help/connect-smtp) [Next**Why we don't do warm-up**](/help/no-warmup)

**Still stuck?** Use the chat button inside the app, or email us at [support@example.com](mailto:support@example.com).