Limits and Availability
This page summarizes the sending, size, and rate limits that apply when Authors build and send Editions, plus the features that are gated by plan or entitlement. Exact values depend on your contract and configuration, so treat the numbers below as representative placeholders — (confirm the exact limits for your account).
Reference
| Item | Limit type | Representative value | Notes |
|---|---|---|---|
| Broadcast size (subscribers per send) | Sending | Plan-dependent (e.g. up to your contracted volume) | Very large audiences may be metered or throttled. |
| Monthly / annual send volume | Entitlement | Per contract | Overages may require an add-on. |
| Send rate (throughput) | Rate | Managed per account/domain | Warm-up and reputation can cap effective throughput. |
| Transactional API requests | Rate | e.g. N requests/second | Bursts above the limit return a rate-limit response. |
| Edition HTML size | Size | e.g. ~100 KB recommended | Larger emails risk clipping in some inbox clients. |
| Attachment / image asset size | Size | e.g. a few MB per asset | Prefer hosted images over inline attachments. |
| Subscriber list / import size | Size | Plan-dependent | Large imports may process asynchronously. |
| SMS message length | Size | 160 chars per segment (GSM-7) | Longer messages split into multiple billed segments. |
| Interactive content (surveys, polls) | Entitlement | Feature-gated | May require a specific plan or add-on. |
| Microsites / landing pages | Entitlement | Feature-gated | Availability and page counts vary by plan. |
| SSO (Microsoft Entra ID) | Entitlement | Admin add-on | Requires configuration by an account admin. |
| Automation / journeys | Entitlement | Feature-gated | Step and volume limits are plan-dependent. |
Notes
- Values in the table are placeholders for illustration. Your account's real limits appear in your plan or account settings — (confirm the exact steps in your account).
- Rate limits protect deliverability. If you hit a limit, sends are queued or throttled rather than dropped; API calls may receive a rate-limit response and should be retried with backoff.
- Feature availability is controlled by entitlement. If a feature is hidden or disabled, it is likely not included in your plan — contact your account admin or support to enable it.
- Size limits differ by channel (email vs. SMS) and by asset type. When in doubt, keep Editions lean to improve rendering and deliverability.
Related
Canonical terms: Author, Edition, Folder (Project Folder), Broadcast. See the Glossary.