Remove gmail warning email not verified when sending mail with PHP - php

Question

Good morning,
I want to remove the gmail warning 'gmail couln't verify that ...#... sent this message' when I send email with php.
I know it is because I use the email function php that don't have authentification so I try PHPMailer and PHP pear but the page turn and turn until the infinite and nothing is happened.
My host is 1&1.
I try with gmail instead smtp and account instead of 1&1 but same result.
<?php
// Pear Mail Library
require_once "Mail.php";
$from = '<***#motelavigna.co>'; //change this to your email address
$to = '<***#gmail.com>'; // change to address
$subject = 'Insert subject here'; // subject of mail
$body = "Hello world! this is the content of the email"; //content of mail
$headers = array(
'From' => $from,
'To' => $to,
'Subject' => $subject
);
$smtp = Mail::factory('smtp', array(
'host' => 'auth.smtp.1and1.fr',
'port' => '465',
'auth' => true,
'username' => '***#***.co', //co is not an error
'password' => '***' // your password
));
// Send the mail
$mail = $smtp->send($to, $headers, $body);
?>
thanks.

Answer 1

I came across this issue recently too and realised the problem is not from the PHP script, as I first thought, but from not having an SPF record for the domain name.
An SPF record identifies which mail servers are permitted to send emails from a particular domain name. If the domain doesn't have an SPF record then Gmail can't verify that the email came from the right place.
Coincidentally I'm also with 1&1, so see here for how to set up SPF records for 1&1. The value you need to use is:
v=spf1 include:_spf.perfora.net include:_spf.kundenserver.de -all
You can also check if the email passed the SPF test by clicking the arrow at the top of the email in Gmail, and pressing 'Show original'.