diff --git a/api/src/ProposalSystem.Api/Services/DevEmailService.cs b/api/src/ProposalSystem.Api/Services/DevEmailService.cs
index a0447d6..2eadb9a 100644
--- a/api/src/ProposalSystem.Api/Services/DevEmailService.cs
+++ b/api/src/ProposalSystem.Api/Services/DevEmailService.cs
@@ -18,9 +18,26 @@ public class DevEmailService : IEmailService
         string pdfUrl,
         CancellationToken ct = default)
     {
+        var maskedRecipient = MaskEmail(toEmail);
         _logger.LogInformation(
             "Dev mode - skipping email delivery: proposal {ProposalNumber} to {Recipient}, PDF link: {PdfUrl}",
-            proposalNumber, toEmail, pdfUrl);
+            proposalNumber, maskedRecipient, pdfUrl);
         return Task.CompletedTask;
     }
+
+    private static string MaskEmail(string email)
+    {
+        if (string.IsNullOrWhiteSpace(email))
+        {
+            return "[redacted]";
+        }
+
+        var atIndex = email.IndexOf('@');
+        if (atIndex <= 1)
+        {
+            return "[redacted]";
+        }
+
+        return $"{email[0]}***{email.Substring(atIndex)}";
+    }
 }