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/// Initializes the mail server: sets up the Telegram API client and
/// validates all required configuration values.
///
/// # Arguments
/// * `settings` - Parsed application configuration.
///
/// # Errors
/// Returns an error if required configuration values are missing or invalid.
/// Returns an error if required configuration values are missing or invalid,
/// Telegram API client creation fails, or the address regex cannot be built.
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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pub fn get_id (&self, name: &str) -> Result<&ChatPeerId> {
if self.address.is_match(name) {
Ok(self.tg.get(name).unwrap_or(&self.tg.default))
} else {
bail!("Email address {name:?} is not from an allowed domain.");
} }
/// Forwards the buffered email to each distinct destination chat, using the
/// default chat for allowed addresses without a configured recipient.
///
/// Inlines the first plain-text body if the escaped message is below 4096
/// bytes. Sends remaining text parts and decoded attachments as documents;
/// HTML body parts are omitted. Leaves the buffered data and envelope intact.
///
/// Attempt to deliver one message
/// # Errors
/// Returns an error for a missing envelope, no recipients, a disallowed
/// address, mail parsing or part extraction failures, or rejected closing
/// `pre`/`code` tags in text passed to validation. Propagates media-group
/// construction and Telegram request errors, including diagnostic sends.
/// Delivery to earlier chats is not rolled back if a later send fails.
async fn relay_mail (&self) -> Result<()> {
if let Some(headers) = &self.headers {
let mail = mail_parser::MessageParser::new().parse(&self.data)
.context("Failed to parse mail.")?;
// Adding all known addresses to recipient list, for anyone else adding default
// Also if list is empty also adding default
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