{
    "name": "signify-nz/silverstripe-mailblock",
    "description": "CMS configurable email redirection.",
    "type": "silverstripe-vendormodule",
    "homepage": "http://github.com/signify-nz/silverstripe-mailblock",
    "keywords": ["silverstripe", "mailblock", "email", "redirect"],
    "license": "BSD-3-Clause",
    "authors": [
        {"name": "Signify","homepage": "http://signify.co.nz"}
    ],
    "support": {
        "issues": "http://github.com/signify-nz/silverstripe-mailblock/issues"
    },
    "require": {
        "silverstripe/cms": "^4",
        "silverstripe/framework": "^4"
    },
    "extra": {
        "expose": [
            "javascript"
        ]
    }
}

{
    "name": "signify-nz/silverstripe-mailblock",
    "description": "CMS configurable email redirection.",
    "type": "silverstripe-vendormodule",
    "homepage": "http://github.com/signify-nz/silverstripe-mailblock",
    "keywords": ["silverstripe", "mailblock", "email", "redirect"],
    "license": "BSD-3-Clause",
    "authors": [
        {"name": "Signify","homepage": "http://signify.co.nz"}
    ],
    "support": {
        "issues": "http://github.com/signify-nz/silverstripe-mailblock/issues"
    },
    "require": {
        "silverstripe/framework": "^4",
        "silverstripe/siteconfig": "^4"
    },
    "extra": {
        "expose": [
            "javascript"
        ]
    }
}

Add Silverstripe SiteConfig as a requirement and remove SilverStripe CMS as a requirement.
fix: Add Silverstripe SiteConfig as a requirement and remove SilverStripe CMS as a requirement.
