All email managed by VPS with Webuzo seems to goes into SPAM of Gmail, Aol.com, Outlook ...
For test this you have to open new account of Gmail or Aol - a clean account where you have not whitlisted or inserted in the contact address your email.
For this problem i have moved all emails into external service and now works but i need and i want can manage emails from my VPS... so i don't know if is DKIM but maybe not only this because i had see an email sended to clean gmail account with DKIM not valid not go into SPAM.
So i replly hope to hear and know more about this issue.. and hope can be fixxed soon.. or email won't work well. Thanks.