Does ILMessageFilterExtension receive callbacks for end-to-end encrypted RCS messages on iOS 26.5?

Question

Rajkumar_nag_120 OP

Created 2h

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Hello Apple Developer Support,

We are using ILMessageFilterExtension with the IdentityLookup framework to classify carrier messages.

We have already verified that the Message Filter extension is invoked for RCS messages. Our remaining question is specifically about end-to-end encrypted RCS messages on iOS 26.5.

Could Apple please clarify the expected behavior for RCS E2EE messages?

When an RCS conversation is end-to-end encrypted, is ILMessageFilterExtension expected to receive an ILMessageFilterQueryRequest callback?
If the extension is invoked for RCS E2EE, does ILMessageFilterQueryRequest.messageBody contain the decrypted message body locally on device?
If the extension is not invoked for RCS E2EE, is this expected behavior because the message content is end-to-end encrypted?
Is the behavior different based on carrier, region, or RCS encryption availability?
Is there any public Apple documentation that explicitly describes IdentityLookup / Message Filter behavior for RCS E2EE messages?

Environment:

iOS version: 26.5
Framework: IdentityLookup
Extension: ILMessageFilterExtension
API: ILMessageFilterQueryHandling.handle(_:context:completion:)
Confirmed behavior: Message Filter extension is invoked for RCS messages
Question: Whether the same behavior applies to end-to-end encrypted RCS messages

We need this clarification to finalize expected product behavior and test coverage for RCS E2EE message filtering.

Answer 1

Rajkumar_nag_120 OP

2h

Note: Apple's official documentation at SMS and MMS Message Filtering only references SMS/MMS and does not mention RCS. We are seeking clarification on whether ILMessageFilterExtension behavior extends to RCS, particularly E2EE RCS messages.

https://developer.apple.com/documentation/identitylookup/sms-and-mms-message-filtering