feat: added teh small sieve script to replace .forwards

src/skynet/services/email.md

@@ -29,5 +29,15 @@ Sieve scripts allow you to sort and manage yer email in a programmatic way.
 Recommended tool: <https://github.com/thsmi/sieve>  
 Small tutorial will follow later.
 
+### ``.forwards`` replacement
+Since we no longer support ``.forwards`` this is the sieve script counterpart.  
+It copies all incoming mail to the target address.  
+
+```sieve
+require "copy";
+
+redirect :copy "sending_mail_to@example.ie";
+```
+
 ### Committee/Admins
 There is an inbuilt sieve script that passes mail from committee/admin addresses into a folder in their Skynet inbox.