Maybe it would make sense to read the `TO` content from `options.cfg` instead of hardcode it, as in `https://github.com/leapcode/mail_breaker/blob/master/src/swaks-batch.sh`

```bash
# Python helper to read configurations from file:
TO=`python -c "from ConfigParser import SafeConfigParser as scp; p = scp(); p.read('options.cfg'); print p.get('Configs', 'to');"`
SUBST_EXPR='s/{FROM}/test@cdev.bitmask.net/;s/{TO}/$TO/'
```

I don't know what are this emails files for, but maybe we can have the `FROM` field from the `options.cfg` too.