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/// validates all required configuration values.
///
/// # Arguments
/// * `settings` - Parsed application configuration.
///
/// # Errors
/// Returns an error if required configuration values are missing or invalid.
/// server fails to start.
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/// validates all required configuration values.
///
/// # Arguments
/// * `settings` - Parsed application configuration.
///
/// # Errors
/// Returns an error if required configuration values are missing or invalid.
pub fn new (settings: config::Config) -> Result<MailServer> {
let api_key = settings.get_string("api_key")
.context("[smtp2tg.toml] missing \"api_key\" parameter.\n")?;
let mut recipients = HashMap::new();
for (name, value) in settings.get_table("recipients")
.context("[smtp2tg.toml] missing table \"recipients\".\n")?
{
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