I think you have a bug here:

```javascript
$ abc=false node
> process.env.abc
'false'
> !!process.env.abc
true
```

Why not do:

```javascript
var ALLOW_SEND_EVENT_CREATE_EMAIL = process.env.ALLOW_SEND_EVENT_CREATE_EMAIL === 'true';
```
or better yet, have the env var be 1 if true:

```javascript
var ALLOW_SEND_EVENT_CREATE_EMAIL = process.env.ALLOW_SEND_EVENT_CREATE_EMAIL === 1;
```

Using false feels wrong to me.