After upgrading to version 8.7 email notifications are not working.
The following message is displayed in the Email setting module after testing the settings:
Sending test message failed.
Could not load file or assembly 'System.Formats.Asn1, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified.