Default value missing for defaultReturnPath of SieveSystemInterpreter

Issue Description

The Return Path of the System Sieve Interpreter is required, but it is empty by default. So any changes to that page (admin/Settings/x:SieveSystemInterpreter) can’t be saved in the web interface.
There should be a default value provided for this.

Expected Behavior

No default value is set for the return path of the system sieve interpreter

Actual Behavior

A default value is set for the return path of the system sieve interpreter

Stalwart Version

v0.16.7

Installation Method

Binary (Linux)

Database Backend

RocksDB

Blob Storage

Filesystem

Search Engine

Internal

Directory Backend

Internal

I have reviewed the documentation and FAQ and confirm that my issue is NOT addressed there.

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I have searched this support forum (open and closed topics) and confirm this is not a duplicate.

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I understand that topics in this category are triaged by a bot first but a human reply will follow up. If I’d prefer a human-only reply, I’ll add the no-ai tag to my topic.

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