reply.push(format!("<u><i>Date:</i></u> <code>{date}</code>"));
			}
			reply.push("</blockquote><pre>".into());
			let reply = reply.join("\n");

			let text_parts = mail.text_body().len();
			let html_parts = mail.html_body().len();
			let attachments = mail.attachments().len();
			if html_parts != text_parts {
				self.tg.debug(&format!("Hm, we have {html_parts} HTML parts and {text_parts} text parts.")).await?;
			}
			//let mut html_num = 0;
			let mut text_num = 0;
			let mut file_num = 0;
			// let's display first html or text part as body
			let mut body: String = "".into();
			// Display the first text part as the body if it fits.
			let mut body = String::new();
			/*
			 * actually I don't wanna parse that html stuff
			if html_parts > 0 {
			if text_parts > 0 {
				let text = mail.body_html(0).stack()?;
				if text.len() < 4096 - header_size {
					body = text;
					html_num = 1;
				}
			};
			*/
			if body.is_empty() && text_parts > 0 {
				let text = mail.body_text(0)
					.context("Failed to extract text from message")?
					.replace("\r\n", "\n");
				let text = validate(&text).stack()?;
				// 6:
				// - (headers)
				// - (mail text)
				// - 6: </pre>
				if text.len() < 4096 - ( reply.len() + 6 ) {
					body = text.to_string();
					body = text.into_owned();
					text_num = 1;
				}
			};
			let msg = format!("{}{}</pre>", reply, body);

			// and let's collect all other attachment parts
			let mut files_to_send = vec![];
			/*
			 * let's just skip html parts for now, they just duplicate text?
			while html_num < html_parts {
			// Send remaining text-body parts followed by attachments.
				files_to_send.push(mail.html_part(html_num).stack()?);
				html_num += 1;
			}
			*/
			while text_num < text_parts {
				files_to_send.push(mail.text_body().nth(text_num)
			let files_to_send: Vec<_> = mail.text_body().skip(text_num)
					.context("Failed to get text part from message.")?);
				text_num += 1;
			}
			while file_num < attachments {
				files_to_send.push(mail.attachments().nth(file_num)
				.chain(mail.attachments()).collect();
					.context("Failed to get file part from message.")?);
				file_num += 1;
			}

			for chat in rcpt {
				if !files_to_send.is_empty() {
					let mut files = vec![];
					// let mut first_one = true;
					for chunk in &files_to_send {
						let data: Vec<u8> = chunk.decoded().to_vec();
						let mut filename: Option<String> = None;
						for header in chunk.headers() {
							if header.raw_name() == "Content-Type" {
								match header.value() {
									mail_parser::HeaderValue::ContentType(contenttype) => {
										if let Some(fname) = contenttype.attribute("name") {
											filename = Some(fname.to_owned());
										}
									},
									_ => {
										self.tg.debug("Attachment has bad ContentType header.").await?;
									},
								};
							};
						for header in chunk.headers().iter()
							.filter(|header| header.raw_name() == "Content-Type")
						{
							match header.value() {
								mail_parser::HeaderValue::ContentType(contenttype) => {
									if let Some(fname) = contenttype.attribute("name") {
										filename = Some(fname.to_owned());
									}
								},
								_ => {
									self.tg.debug("Attachment has bad ContentType header.").await?;
								},
							};
						};
						};
						let filename = if let Some(fname) = filename {
							fname
						} else {
							"Attachment.txt".into()
						};
						files.push(Attachment {
							data: Cursor::new(data),
							name: filename,
							name: filename.unwrap_or_else(|| "Attachment.txt".into()),
						});
					}
					self.tg.sendgroup(chat, files, &msg).await?;
				} else {
					self.tg.send(chat, &msg).await?;
				}
			}

use std::{
	os::unix::fs::PermissionsExt,
	path::Path,
};

use clap::Parser;
use smol::{
use smol::fs::metadata;
	fs::metadata,
};
use stacked_errors::{
	Result,
	StackableErr,
	bail,
};

use smtp2tg::mail::MailServer;

/// Also returns an error if the system hostname cannot be read or is not
/// valid UTF-8, or if mail server initialisation fails.
///
/// # Panics
/// Panics if configuring or serving the SMTP server fails.
	async fn main (ex: &LocalExecutor<'_>) -> Result<()> {
		let args = Args::parse();
		let settings = {
			// Load configuration defaults and overrides after checking file permissions.
		let config_file = Path::new(&args.config);
		if !config_file.try_exists().stack()? {
			bail!("Configuration file not found: {config_file:?}\n\
				Hint: Ensure the file exists and the path is correct.");
		};
		{
			let meta = metadata(config_file).await.stack()?;
			if (!0o100600 & meta.permissions().mode()) > 0 {
				bail!("Configuration file permissions are insecure {config_file:?}\n\
					Current permissions: {:o}\n\
					Required: 0600 (owner read/write only).\n\
					Fix with: chmod 600 {config_file:?}",
					meta.permissions().mode());
		}	}
		let settings: config::Config = config::Config::builder()
			.set_default("api_gateway", "https://api.telegram.org").stack()?
			.set_default("fields", vec!["date", "from", "subject"]).stack()?
			.set_default("hostname", "smtp.2.tg").stack()?
			.set_default("listen_on", "0.0.0.0:1025").stack()?
			.set_default("domains", vec!["localhost",
				hostname::get().context("Failed to get current hostname")?
				.to_str().context("Can't convert hostname to string, bad UTF-8?")?]).stack()?
			.add_source(config::File::from(config_file))
			.build()
			.with_context(|| format!(
				"Failed to parse configuration file: {config_file:?}\n\
				Check syntax against smtp2tg.toml.example.\n\
				Common issues: missing quotes, trailing commas in inline tables, or invalid types."
			))?;
			let config_file = Path::new(&args.config);
			if !config_file.try_exists().stack()? {
				bail!("Configuration file not found: {config_file:?}\n\
					Hint: Ensure the file exists and the path is correct.");
			};
			{
				let meta = metadata(config_file).await.stack()?;
				if (!0o100600 & meta.permissions().mode()) > 0 {
					bail!("Configuration file permissions are insecure {config_file:?}\n\
						Current permissions: {:o}\n\
						Required: 0600 (owner read/write only).\n\
						Fix with: chmod 600 {config_file:?}",
						meta.permissions().mode());
			}	}
			config::Config::builder()
				.set_default("api_gateway", "https://api.telegram.org").stack()?
				.set_default("fields", vec!["date", "from", "subject"]).stack()?
				.set_default("hostname", "smtp.2.tg").stack()?
				.set_default("listen_on", "0.0.0.0:1025").stack()?
				.set_default("domains", vec!["localhost",
					hostname::get().context("Failed to get current hostname")?
					.to_str().context("Can't convert hostname to string, bad UTF-8?")?]).stack()?
				.add_source(config::File::from(config_file))
				.build()
				.with_context(|| format!(
					"Failed to parse configuration file: {config_file:?}\n\
					Check syntax against smtp2tg.toml.example.\n\
					Common issues: missing quotes, trailing commas in inline tables, or invalid types."
				))?
		};

		let listen_on = settings.get_string("listen_on").stack()?;
		let server_name = settings.get_string("hostname").stack()?;
		let core = MailServer::new(settings)?;
		let mut server = mailin_embedded::Server::new(core);

		// TODO: remove unwraps when mailin-embedded bumps with better error handling