fix "from" email

src/main.rs

@@ -89,7 +89,7 @@ fn is_alert_needed(
 async fn send_email(email: &str, repo: &str, inactive: Duration) -> eyre::Result<()> {
     use lettre::{AsyncSendmailTransport, AsyncTransport, Message};
     let email = Message::builder()
-        .from("infracoll <infracoll>".parse().unwrap())
+        .from("infracoll <root@infracoll>".parse().unwrap())
         .to(email.parse()?)
         .subject(format!("restic-alarm: inactive repository {}", repo))
         .body(format!(