title: Serilog send mail if exception is thrown in specific assembly
body: <p>I'm working on a asp.net core (2.2) app that contains multiple assemblies. 
  For logging I use serilog for asp.net core.
  Now there's a requirement to send a mail when an exception is thrown.
  The crux is: The email shall only be sent if the exception is thrown in one specific assembly.
  Is there a way to achieve this with the serilog email sink?
  Thank you.</p>