На IronPort в CLI посмотрите фильтр stripheaders
mail3.example.com> stripheaders
Not currently stripping any headers.
Choose the operation you want to perform:
- SETUP - Set message headers to remove.
[]> setup
Enter the list of headers you wish to strip from the messages before they
are delivered. Separate multiple headers with commas.
[]> Delivered-To
Currently stripping headers: Delivered-To
Choose the operation you want to perform:
- SETUP - Set message headers to remove.
[]>
mail3.example.com>
