Email center: General settings form

<?xml version="1.0" encoding="UTF-8"?>

<form i18nBaseUri="cms:emailcenter.settings.general.form." feature="emailCenter">
    <tab id="default" sortorder="10">
        <fieldset id="default" sortorder="10">
            <field sortorder="10" name="default_from_address" control="textinput" required="false">
                <rule validator="allowedSenderEmail" />
            </field>
            <field sortorder="20" name="allowed_sending_domains" control="textarea" required="false" />
        </fieldset>
        <fieldset id="providers" sortorder="20">
            <field sortorder="10" name="defaultProvider"   control="emailServiceProviderPicker" addDefaultProvider="false" includeDisabledProviders="true" required="false" />
            <field sortorder="20" name="disabledProviders" control="emailServiceProviderPicker" addDefaultProvider="false" includeDisabledProviders="true" required="false" multiple="true" />
        </fieldset>
        <fieldset id="content" sortorder="30">
            <field sortorder="10" name="default_content_expiry"     control="spinner"     required="false" defaultValue="90" minValue="0" />
            <field sortorder="20" name="max_content_expiry"         control="spinner"     required="false" defaultValue="90" minValue="0" />
            <field sortorder="30" name="remove_view_online_content" control="yesnoswitch" required="false" />
            <field sortorder="40" name="view_online_content_expiry" control="spinner"     required="false" defaultValue="90" minValue="0" />
        </fieldset>
        <fieldset id="masssendout" sortorder="40">
            <field sortorder="10" name="ratelimit" control="spinner" required="false" default="100" />
        </fieldset>
        <fieldset id="features" sortorder="50">
            <field sortorder="10" name="resendtoken" control="yesnoswitch" required="false" default="false" />
        </fieldset>
        <fieldset id="clicktracking" sortorder="60">
            <field sortorder="10" name="disable_link_checking"   control="yesnoswitch" required="false" default="false" />
            <field sortorder="20" name="link_checking_allowlist" control="textarea" />
        </fieldset>
    </tab>
</form>