> ## Documentation Index
> Fetch the complete documentation index at: https://docs.conversion.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Configure communication limits, link tracking, and marketing topics for email sending in Conversion.

The **Overview** tab contains global email settings that apply across all emails sent from your workspace.

## Communication limits

Communication limits cap how many emails can be sent to a single email address within a given time period. This acts as a safeguard against accidentally over-sending — for example, if a contact is enrolled in multiple workflows or is included in several blast audiences at once.

You can set limits at three cadences:

| Cadence     | Description                                                         |
| ----------- | ------------------------------------------------------------------- |
| **Daily**   | Maximum number of emails sent per email address in a 24-hour window |
| **Weekly**  | Maximum number of emails sent per email address in a 7-day window   |
| **Monthly** | Maximum number of emails sent per email address in a 30-day window  |

Click **Add limit** next to a period to configure a cap.

<Tip>
  If a contact exceeds a limit, the email will not be sent to them for that send cycle.
</Tip>

<Note>
  Individual emails can bypass these limits using the **Ignore communication limits** or **Set as operational** toggles on the email. See [Delivery overrides](/product-docs/emails/blasts/creating-a-blast#delivery-overrides) for details.
</Note>

### Per-email send cap

In addition to the workspace-level cadences above, Conversion enforces a hard cap of **3 sends of the same email to the same recipient address within an 8-hour rolling window**. This cap counts rows in both **Sent** and **Sending** statuses (excluding the current row) and takes priority over your configured communication limits.

This cap only applies to repeat sends of the *same* email (matched by `email_id`). Sends of different emails to the same recipient are not affected — for example, if your daily limit is 4, a recipient can still receive up to 4 different emails in a 24-hour window.

## Link tracking

When link tracking is enabled, Conversion wraps all links in your emails so that clicks are recorded and attributed back to the email. UTM parameters are also automatically appended to tracked links.

Toggle **Track link clicks** to enable or disable this. When disabled, links are sent as-is and click activity is not tracked.

<Info>
  Tracked link clicks are what power the click-through rate and total unique clicks metrics visible on the [Performance](/product-docs/emails/performance) tab.
</Info>

### UTM parameters on tracked links

When link tracking is enabled, Conversion automatically appends UTM parameters to every tracked link in an email so you can attribute traffic and conversions back to the email in your downstream analytics tools.

| Parameter      | Value                    | Notes                                                                                                 |
| -------------- | ------------------------ | ----------------------------------------------------------------------------------------------------- |
| `utm_source`   | `conversion`             | Default; only added if the link doesn't already have it                                               |
| `utm_medium`   | `email`                  | Default; only added if the link doesn't already have it                                               |
| `utm_campaign` | The email's name         | Default; falls back to `Conversion Email` if the email is untitled. Only added if not already present |
| `cai_email`    | The unique sent-email ID | Internal attribution parameter; always set                                                            |

<Note>
  For the three standard UTMs (`utm_source`, `utm_medium`, `utm_campaign`), your value always wins. If a link already includes one of these, Conversion leaves it untouched and only fills in the ones that are missing.
</Note>

The internal `cai_email` parameter is always set, overwriting any existing value, because it's required for click attribution.

<Tip>
  Only `http` and `https` links receive UTMs. Other link types (for example, `mailto:` or `tel:`) are skipped, and subscription/unsubscribe management links are never tracked or modified.
</Tip>

If link tracking is disabled, no UTMs are applied — links are sent as-is and clicks aren't tracked.

## Marketing topics

Marketing topics let you categorize your emails. Topics help your team stay organized across a large volume of emails.

A **Default** topic is created automatically and applied to all emails unless you specify otherwise. To add a new topic, click **Add email topic**.

### Subscriptions and topic-level unsubscribes

Every recipient has a global subscription status (such as **Subscribed** or **Unsubscribed**) that controls whether they can receive marketing emails at all. In addition, recipients can **unsubscribe from individual marketing topics** while staying globally subscribed.

These two levels behave independently:

* A recipient's status only becomes **Unsubscribed** when they toggle off the global **Unsubscribe from all** option.
* Toggling off one or more individual topics — even all of them — does **not** change their global status. This is intentional, so the recipient can still receive emails on new topics you add in the future.

When an email is sent, Conversion skips the recipient if they are not globally subscribed, **or** if they have unsubscribed from that email's specific topic. In the latter case, the email shows a "Recipient is unsubscribed from this topic" reason on the [Recipients](/product-docs/emails/recipients) tab.

#### One-click unsubscribe

Conversion supports **one-click unsubscribe** (also known as list-unsubscribe). Every marketing email includes the standard `List-Unsubscribe` and `List-Unsubscribe-Post` headers, which let email clients like Gmail and Apple Mail show a built-in "Unsubscribe" button at the top of the message. This also helps keep you compliant with bulk-sender requirements from major inbox providers.

When a recipient uses the one-click unsubscribe button, they are unsubscribed **only from the marketing topic that email is assigned to** — not from all of your emails. Their global subscription status stays **Subscribed**, so they continue to receive emails on your other topics. To opt out entirely, a recipient uses the **Unsubscribe from all** option on the [subscription management page](/product-docs/emails/recipients#how-unsubscribing-works).

<Note>
  Operational emails bypass subscription checks entirely and are delivered regardless of global or topic-level unsubscribes. They do not include one-click unsubscribe headers.
</Note>

For the full breakdown of subscription statuses and unsubscribe behavior, see [Recipients](/product-docs/emails/recipients#how-unsubscribing-works).