diff --git a/tools/TestFx/Utilities/EmailServiceUtility.psm1 b/tools/TestFx/Utilities/EmailServiceUtility.psm1
index 27e705b7a78c..443c44f143a2 100644
--- a/tools/TestFx/Utilities/EmailServiceUtility.psm1
+++ b/tools/TestFx/Utilities/EmailServiceUtility.psm1
@@ -44,7 +44,7 @@ function Send-EmailServiceMail {
         [string] $Subject,
 
         [Parameter(Mandatory)]
-        [string] $Content,
+        $Content, # The type of this parameter is dynamic. Omitting the type here to avoid exception.
 
         [Parameter()]
         [switch] $IsHtml