diff --git a/smtpproxy.net/Email.cs b/smtpproxy.net/Email.cs
index 1abe342..ef7695c 100644
--- a/smtpproxy.net/Email.cs
+++ b/smtpproxy.net/Email.cs
@@ -1,29 +1,47 @@
-using System.Collections.Generic;
-
-namespace smtpproxy.net;
-
-public class Email
-{
-	public string FromIP;
-
-	public string sHELO;
-
-	public string sMAIL;
-
-	public string sDATA;
-
-	public List<string> sRCPTs;
-
-	public string GetRecipientEmail(string sRCPTTo)
-	{
-		return sRCPTTo.ToLower().Replace("rcpt to:", "").Replace("<", "")
-			.Replace(">", "")
-			.Replace("\r", "")
-			.Replace("\n", "");
-	}
-
-	public Email()
-	{
-		sRCPTs = new List<string>();
-	}
-}
+using System;
+using System.Collections.Generic;
+
+namespace smtpproxy.net
+{
+    public class Email
+    {
+        public string FromIP { get; set; }
+        public string sHELO { get; set; }
+        public string sMAIL { get; set; }
+        public string sDATA { get; set; }
+        public List<string> sRCPTs { get; set; }
+
+        public Email()
+        {
+            FromIP = string.Empty;
+            sHELO = string.Empty;
+            sMAIL = string.Empty;
+            sDATA = string.Empty;
+            sRCPTs = new List<string>();
+        }
+
+        public string GetRecipientEmail(string sRCPTTo)
+        {
+            if (string.IsNullOrEmpty(sRCPTTo))
+                return string.Empty;
+
+            string cleaned = sRCPTTo
+                .Replace("\r", "")
+                .Replace("\n", "")
+                .Replace("<", "")
+                .Replace(">", "")
+                .Trim();
+
+            if (cleaned.StartsWith("rcpt to:", StringComparison.OrdinalIgnoreCase))
+            {
+                cleaned = cleaned.Substring(8).Trim();
+            }
+            else if (cleaned.StartsWith("rcpt to", StringComparison.OrdinalIgnoreCase))
+            {
+                cleaned = cleaned.Substring(7).Trim();
+            }
+
+            return cleaned.ToLowerInvariant();
+        }
+    }
+}
\ No newline at end of file