Replace domain placeholder

Reply with lib name or custom set env variable

src/lib.rs

@@ -86,4 +86,5 @@ mod tests {
         log::info!("Received mail: {:?}", mail);
         listening_server.stop().await.unwrap();
     }
+
 }

src/parser/ehlo.rs

@@ -1,5 +1,4 @@
 use std::str::SplitWhitespace;
-
 use tokio::io;
 
 use crate::{
@@ -22,7 +21,7 @@ pub fn ehlo(
     }
     // Return based on the TLS configuration
     Ok(match connection.tls_config {
-        TlsConfig::Encrypted { .. } => EHLO_TLS_AVAILABLE,
-        _ => EHLO_TLS_UNAVAILABLE,
+        TlsConfig::Encrypted { .. } => &EHLO_TLS_AVAILABLE,
+        _ => &EHLO_TLS_UNAVAILABLE,
     })
 }

src/parser/helo.rs

@@ -1,5 +1,4 @@
 use std::str::SplitWhitespace;
-
 use tokio::io;
 
 use crate::{
@@ -21,5 +20,5 @@ pub fn helo(
         connection.state = State::Ehlo("".to_string());
     }
     // We never support TLS on HELO
-    Ok(EHLO_TLS_UNAVAILABLE)
+    Ok(&EHLO_TLS_UNAVAILABLE)
 }

src/parser/responses.rs

@@ -1,7 +1,15 @@
+use std::{env, sync::LazyLock};
+
 // Responses as per RFC 5321
 // The following are the responses that the server can send to the client as per RFC 5321:
-pub static EHLO_TLS_AVAILABLE: &[u8] = b"250-%DOMAIN%\r\n250 STARTTLS\r\n";
-pub static EHLO_TLS_UNAVAILABLE: &[u8] = b"250 %DOMAIN%\r\n";
+pub static EHLO_TLS_AVAILABLE:LazyLock<Vec<u8>> = LazyLock::new(|| {
+    let domain=env::var("MINISMTP_DOMAIN").unwrap_or_else(|_| "minismtp".to_string());
+    format!("250-{}\r\n250 STARTTLS\r\n",domain).as_bytes().to_vec()
+});
+pub static EHLO_TLS_UNAVAILABLE:LazyLock<Vec<u8>> = LazyLock::new(|| {
+    let domain=env::var("MINISMTP_DOMAIN").unwrap_or_else(|_| "minismtp".to_string());
+    format!("250 {}\r\n",domain).as_bytes().to_vec()
+});
 pub static OK: &[u8] = b"250 OK\r\n";
 pub static READY_FOR_TLS: &[u8] = b"220 Ready to start TLS\r\n";
 pub static TLS_NOT_AVAILABLE: &[u8] = b"502 TLS not available\r\n";