Function read 

pub fn read(
    words: &VoicemailWords,
    raw: &[u8],
    path: &Path,
    region: Option<&Region>,
    zone: &TimeZone,
    trusted: &[String],
) -> Option<Voicemail>

The voicemail a mail is, if it is one, read with words (the operators’ domains, the words of the languages in use). zone reads the time its text gives (the operator’s local time); region, numbers without a country; trusted, the authserv-ids of the provider that delivered it (config::Source::trusted_ids): a mail its own checks find forged in an operator’s name is never one.