# Domain and server checks | GTM and Outreach

Source: https://exntra.in/help/domain-health

[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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# Domain and server checks

What we check every day, what each result means, and how to fix it.

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

Open **Mailboxes**, then click a domain. You see its bounce rate, its DNS records and **Deeper checks**. We run these checks every day.

## What we check

| Check | Good | What to do if not |
| --- | --- | --- |
| Spamhaus domain blocklist | Not listed | Stop sending from the domain. Request removal at check.spamhaus.org. |
| Domain age | 30 days or older | Wait. Until then we send at most 10 a day. |
| SPF DNS lookups | 10 or fewer | Remove includes you don’t use. |
| DKIM key size | 2048-bit | Create a new 2048-bit key with your provider. |
| DMARC policy | p=quarantine or p=reject | Start with p=none, then move to p=quarantine. |

For **SMTP mailboxes** we also check your provider’s sending servers:

-   **Reverse DNS**: each server’s address should have a name, and that name should point back to the same address.
-   **Spamhaus**: the server’s address should not be on a blocklist.

Google, Microsoft and Zoho manage their own servers, so we skip this for them.

## What to fix

Below the checks, **What to fix** lists each problem in plain words, in order. Fix them from the top.

## Colors

-   **Green**: fine.
-   **Amber**: works, but could be better.
-   **Red**: fix this. It hurts your delivery.
-   **Grey**: not checked yet.

## Alerts

If your domain or your provider’s server gets onto a Spamhaus blocklist, we email the account owner. The mailbox card also shows “On a Spamhaus blocklist”.

## If the blocklist row says “Not set up yet”

The blocklist check isn’t running yet. All other checks still work.

[Previous**Set up SPF, DKIM and DMARC**](/help/dns-records) [Next**Import contacts**](/help/import-contacts)

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