Index: README.md
==================================================================
--- README.md	
+++ README.md	
@@ -31,10 +31,12 @@
 
 [recipients]
 "admin@example.com" = 12345678
 "alerts@example.com" = -10012345678
 ```
+
+All recipients are internally lowercased, so `UserName` equals `username`.
 
 ---
 
 ## Usage
 

Index: src/mail.rs
==================================================================
--- src/mail.rs	
+++ src/mail.rs	
@@ -78,11 +78,11 @@
 		for (name, value) in settings.get_table("recipients")
 			.context("[smtp2tg.toml] missing table \"recipients\".\n")?
 		{
 			let value = value.into_int()
 				.context("[smtp2tg.toml] \"recipient\" table values should be integers.\n")?;
-			recipients.insert(name.to_lowercase().replace('.', ""), value);
+			recipients.insert(name.to_lowercase(), value);
 		}
 
 		let tg = Arc::new(TelegramTransport::new(api_key, recipients, &settings)?);
 		let fields = HashSet::<String>::from_iter(settings.get_array("fields")
 			.context("[smtp2tg.toml] \"fields\" should be an array")?

Index: src/telegram.rs
==================================================================
--- src/telegram.rs	
+++ src/telegram.rs	
@@ -93,11 +93,11 @@
 	/// * `Result<&ChatPeerId>` - Chat ID if found.
 	///
 	/// # Errors
 	/// Returns an error if `name` is not configured.
 	pub fn get (&self, name: &str) -> Result<&ChatPeerId> {
-		self.recipients.get(&name.to_lowercase().replace('.', ""))
+		self.recipients.get(&name.to_lowercase())
 			.with_context(|| format!("Recipient \"{name}\" not found in configuration"))
 	}
 
 	/// Sends a text message to a specified chat.
 	///