---
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title: Event Type, Size, and Features
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/platform/264-0-0/ev_relay_feature_support.md
canonical_url: https://help.salesforce.com/s/articleView?id=platform.ev_relay_feature_support.htm&release=264.0.0&type=5
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content_type: documentation
content_hash: fe631ee0b4cc17113b375f8f0d4bc41e0639e76a7858d225383178b2fd1940c0
description: Check out what event types and features are supported with event relays.
products:
  - Salesforce Platform
  - Security
release: "264"
---
# Event Type, Size, and Features

Check out what event types and features are supported with event relays.

Event Relay supports these event types and maximum sizes.

- Custom high-volume platform events
- Real-time event monitoring events
- Change data capture events
- The maximum event message size that Salesforce supports for published and received events is 1 MB.
- The maximum event message size that Amazon EventBridge supports for incoming and outgoing events is 256 KB.
- If an event message larger than 256 KB is relayed from Salesforce to EventBridge, the event isn’t delivered to EventBridge.

These event types aren’t supported.

- Standard platform events
- Standard-volume custom platform events

These features aren’t supported with Event Relay.

- Salesforce Private Connect
- Developer Edition orgs with namespaces