# Email providers (ESP sending and matching) | GTM and Outreach

Source: https://exntra.in/help/email-providers

[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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# Email providers (ESP sending and matching)

Choose which providers a campaign emails, and send Google leads from Google mailboxes.

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

“ESP” means the email provider your lead uses: Google, Microsoft, Zoho, Yahoo or Other.

## How we know

When you import a list, we look up each domain’s mail servers. Then we tag each contact. “Other” means their own mail servers, iCloud, GoDaddy, or an inbox behind a security tool like Proofpoint or Mimecast.

## ESP sending: choose who gets emailed

In a campaign, under **Targeted ESPs**, choose which providers this campaign emails. For example, only Microsoft.

-   Switching a provider off sets its leads aside right away, even in a running campaign.
-   Switching it back on picks them up again.

## ESP matching: same provider, better delivery

Turn on **ESP matching** in the campaign’s senders step:

-   Google senders email Google leads.
-   Microsoft senders email Microsoft leads.
-   Others use any sender.

Email between the same provider often lands better. If there is no matching sender for a provider, those leads are sent from any of the campaign’s mailboxes.

## Tip

Connect at least one Google and one Microsoft mailbox. Then ESP matching can work for most of your leads.

[Previous**How we check contacts**](/help/contact-checks) [Next**Your blocklist**](/help/blocklist)

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