Hi guys

In my script, there are possibilities of sending many mails per day.
This includes:
  • new user registration email, send to the user
  • notification email like membership expiry, reminder sent before expiry, approval of their uploaded content, etc...
  • Messages sent by Admin to all members
  • etc..

Currently I'm using PHP native mail function to send emails.

My question is, how can I make this mailing feature more efficient and how to not mark it as SPAM by the recipient's mail services.

Thanks