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.

Answer 2

You need to use headers. This worked for me:

$to = "mail@example.com";
$subject = "your subject";
$body = "<p>Your Body</p>";
$headers  = "From: Sender Name <mail2@example.com>" . "\r\n";
$headers .= 'MIME-Version: 1.0' . "\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1\r\n";
mail($to, $subject, $body, $headers);

Additionally you can add a TXT Record for SPF in your Registrar where you got your domain. Go to the DNS Settings and add the following TXT Record:

Type: TXT
Host: example.com
Value: v=spf1 ip4:YOUR.SERVER.IP.HERE ~all
TTL: Automatic

This is for validating that the mail hasn't been spoofed.