SNM Version 2.2.0

Release for Nixos 18.09

New Features

• rejectSender: Allows to reject email addresses or complete domains.
  For documentation on this feature, see default.nix and the comments
  therein. Thanks to tokudan!
  

Bug fixes

• Remove dh file creation (done upstream)
  
• remove deprecated rspamd.socketActivation
  

Thanks to everyone that has contributed!