Index: src/lib.rs
==================================================================
--- src/lib.rs	
+++ src/lib.rs	
@@ -1,10 +1,20 @@
-mod mail;
+pub mod mail;
 mod telegram;
 pub mod utils;
 
+// As we are not actually exporting this lib there would be no local Error's for
+// now, everything will be just .stack()?'ed and propagated like in real bin
+// The lib here is just to separate all tests from main code into tests/
+
 use crate::mail::MailServer;
+
+use std::{
+	io::Cursor,
+	os::unix::fs::PermissionsExt,
+	path::Path,
+};
 
 use just_getopt::{
 	OptFlags,
 	OptSpecs,
 	OptValue,
@@ -16,16 +26,10 @@
 	Result,
 	StackableErr,
 	bail,
 };
 
-use std::{
-	io::Cursor,
-	os::unix::fs::PermissionsExt,
-	path::Path,
-};
-
 /// Actual main function running async with Error propagation support
 pub async fn async_main () -> Result<()> {
 	let specs = OptSpecs::new()
 		.option("help", "h", OptValue::None)
 		.option("help", "help", OptValue::None)
@@ -64,11 +68,13 @@
 		.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("unknown", "relay").stack()?
-		.set_default("domains", vec!["localhost", hostname::get().stack()?.to_str().expect("Failed to get current hostname")]).stack()?
+		.set_default("domains", vec!["localhost",
+			hostname::get().expect("Failed to get current hostname")
+			.to_str().expect("Can't convert hostname to string, bad UTF-8?")]).stack()?
 		.add_source(config::File::from(config_file))
 		.build()
 		.with_context(|| format!("[{config_file:?}] there was an error reading config\n\
 			\tplease consult \"smtp2tg.toml.example\" for details"))?;