{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "title": "Mail Client",
    "description": "Polito Mail Client",
    "type": "array",
    "items": {
        "type": "object",
        "properties": {
            "mailserver": {
                "description": "Mail server name",
                "type": "string"
            }
        },
        "additionalProperties": false,
        "required": [
            "mailserver"
        ]
    },
    "minItems": 1,
    "maxItems": 1,
    "uniqueItems": true
}