diff --git a/Sources/SwiftMailCore/Extensions/StringExtensions.swift b/Sources/SwiftMailCore/Extensions/String+Redacting.swift
similarity index 98%
rename from Sources/SwiftMailCore/Extensions/StringExtensions.swift
rename to Sources/SwiftMailCore/Extensions/String+Redacting.swift
index 4e0d24a..6ed0862 100644
--- a/Sources/SwiftMailCore/Extensions/StringExtensions.swift
+++ b/Sources/SwiftMailCore/Extensions/String+Redacting.swift
@@ -1,4 +1,4 @@
-// StringExtensions.swift
+// String+Redacting.swift
 // String extensions for the SwiftMailCore library
 
 import Foundation
diff --git a/Tests/SwiftIMAPTests/StringUtilitiesTests.swift b/Tests/SwiftIMAPTests/StringUtilitiesTests.swift
deleted file mode 100644
index b8476d0..0000000
--- a/Tests/SwiftIMAPTests/StringUtilitiesTests.swift
+++ /dev/null
@@ -1,86 +0,0 @@
-import Foundation
-import Testing
-import NIOIMAP
-@testable import SwiftIMAP
-
-struct StringUtilitiesTests {
-    
-    // MARK: - Sanitized Filename Tests
-    
-    @Test
-    func testSanitizedFileName() {
-        // Test basic valid filename
-        let validName = "document.txt"
-        #expect(validName.sanitizedFileName() == "document.txt")
-        
-        // Test filename with invalid characters
-        let invalidChars = "file:with*invalid/characters?.txt"
-        #expect(invalidChars.sanitizedFileName() == "file_with_invalid_characters_.txt")
-        
-        // Test filename with spaces
-        let spacesName = "my document.pdf"
-        #expect(spacesName.sanitizedFileName() == "my_document.pdf")
-        
-        // Test filename with special characters
-        let specialChars = "résumé (2023).pdf"
-        #expect(specialChars.sanitizedFileName() == "résumé_(2023).pdf")
-        
-        // Test empty string
-        let emptyString = ""
-        #expect(emptyString.sanitizedFileName() == "")
-    }
-    
-    // MARK: - File Extension Tests
-    
-    @Test
-	func testFileExtension() {
-		// Test common MIME types
-		#expect(String.fileExtension(for: "text/plain") == "txt")
-		#expect(String.fileExtension(for:"text/html") == "html")
-		#expect(String.fileExtension(for:"image/jpeg") == "jpeg")
-		#expect(String.fileExtension(for:"image/png") == "png")
-		#expect(String.fileExtension(for:"application/pdf") == "pdf")
-		
-		// Test less common MIME types
-		#expect(String.fileExtension(for:"audio/mp3") == "mp3")
-		#expect(String.fileExtension(for:"video/mp4") == "mp4")
-		#expect(String.fileExtension(for:"application/zip") == "zip")
-		
-		// Test unknown MIME types
-		#expect(String.fileExtension(for:"application/x-custom") == nil)
-		#expect(String.fileExtension(for:"unknown/type") == nil)
-	}
-    
-    // MARK: - Sequence Set Tests
-    
-    @Test
-    func testToSequenceSet() throws {
-        // Test single number
-        let singleNumber = "42"
-        _ = try singleNumber.toSequenceSet()
-        // We can't directly test the contents, so we'll just verify it doesn't throw
-        
-        // Test simple range
-        let simpleRange = "1:10"
-        _ = try simpleRange.toSequenceSet()
-        // We can't directly test the contents, so we'll just verify it doesn't throw
-        
-        // Test invalid input
-        let invalidRange = "abc"
-        do {
-            _ = try invalidRange.toSequenceSet()
-            throw TestFailure("Expected toSequenceSet to throw for invalid input")
-        } catch {
-            // Expected to throw
-        }
-        
-        // Test empty string
-        let emptyString = ""
-        do {
-            _ = try emptyString.toSequenceSet()
-            throw TestFailure("Expected toSequenceSet to throw for empty string")
-        } catch {
-            // Expected to throw
-        }
-    }
-} 
diff --git a/Tests/SwiftMailCoreTests/StringExtensionsTests.swift b/Tests/SwiftMailCoreTests/String+RedactingTests.swift
similarity index 98%
rename from Tests/SwiftMailCoreTests/StringExtensionsTests.swift
rename to Tests/SwiftMailCoreTests/String+RedactingTests.swift
index 09e38e1..60356c1 100644
--- a/Tests/SwiftMailCoreTests/StringExtensionsTests.swift
+++ b/Tests/SwiftMailCoreTests/String+RedactingTests.swift
@@ -1,4 +1,4 @@
-// StringExtensionsTests.swift
+// String+RedactingTests.swift
 // Tests for string extensions in the SwiftMailCore library
 
 import Testing
@@ -68,4 +68,4 @@ struct StringExtensionsTests {
         let result = loginAtEnd.redactAfter("LOGIN")
         #expect(result == loginAtEnd, "Should not redact when LOGIN is at the end with no credentials")
     }
-} 
\ No newline at end of file
+}