prevent php mail sent going to spam gmail [duplicate]

Answer 1

You can't explicitly control if your emails get flagged as spam, but there are some things you can do to help.

• Make sure your reverse DNS is correct.
• Implement SPF.
• Implement DKIM.
• Install SpamAssassin locally and run a sample of your messages through it with verbose mode on to get an idea of why they might be getting flagged.
• Use a service like MailChimp or MailGun instead of a local deliverer.