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 |
Individual emails can bypass these limits using the Ignore communication limits or Set as operational toggles on the email. See Delivery overrides for details.
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 byemail_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.Tracked link clicks are what power the click-through rate and total unique clicks metrics visible on the Performance tab.
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 |
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.cai_email parameter is always set, overwriting any existing value, because it’s required for click attribution.
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.
One-click unsubscribe
Conversion supports one-click unsubscribe (also known as list-unsubscribe). Every marketing email includes the standardList-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.
Operational emails bypass subscription checks entirely and are delivered regardless of global or topic-level unsubscribes. They do not include one-click unsubscribe headers.