<?php
    $from     =  $_POST['email'];
    $to       = 'meuemail@gmail.com';
    $subject  =  $_POST['subject'];
    $message  =  $_POST['content'];
    $headers  = 'From: ' . $from . "rn" .
            'MIME-Version: 1.0' . "rn" .
            'Content-type: text/html; charset=utf-8';
    if(mail($to, $subject, $message, $headers))
       echo "Email sent";
    else
       echo "Email sending failed";
?>

[sendmail]
smtp_server=smtp.gmail.com
smtp_port = 587
default_domain = gmail.com

auth_username=[seuemail]@gmail.com
auth_password=[suasenha]

[mail function]
sendmail_path = "C:xamppsendmailsendmail.exe -t"
SMTP = smtp.gmail.com
smtp_port = 587

[mail function]
    sendmail_path = "env -i /usr/sbin/sendmail -t -i"
    SMTP = smtp.gmail.com
    smtp_port = 587

<?php
require 'PHPMailerAutoload.php';

$mail = new PHPMailer;

//$mail->SMTPDebug = 3;                               // Enable verbose debug output

$mail->isSMTP();                                      // Set mailer to use SMTP
$mail->Host = 'smtp1.example.com;smtp2.example.com';  // Specify main and backup SMTP servers
$mail->SMTPAuth = true;                               // Enable SMTP authentication
$mail->Username = 'user@example.com';                 // SMTP username
$mail->Password = 'secret';                           // SMTP password
$mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
$mail->Port = 587;                                    // TCP port to connect to

$mail->From = 'from@example.com';
$mail->FromName = 'Mailer';
$mail->addAddress('joe@example.net', 'Joe User');     // Add a recipient
$mail->addAddress('ellen@example.com');               // Name is optional
$mail->addReplyTo('info@example.com', 'Information');
$mail->addCC('cc@example.com');
$mail->addBCC('bcc@example.com');

$mail->addAttachment('/var/tmp/file.tar.gz');         // Add attachments
$mail->addAttachment('/tmp/image.jpg', 'new.jpg');    // Optional name
$mail->isHTML(true);                                  // Set email format to HTML

$mail->Subject = 'Here is the subject';
$mail->Body    = 'This is the HTML message body <b>in bold!</b>';
$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

if(!$mail->send()) {
    echo 'Message could not be sent.';
    echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
    echo 'Message has been sent';
}

<?php

require("phpmailer/class.phpmailer.php");


$mail = new PHPMailer();

$mail->IsSMTP();
$mail->Host = "ssl://smtp.gmail.com";
$mail->SMTPAuth = true;
$mail->SMTPDebug = 0;
$mail->Port = 465;
$mail->SMTPSecure = 'tls';
$mail->Username = 'seuemail@gmail.com';
$mail->Password = 'sua_senha';

$mail->From = "remetente@mail.com";
$mail->Sender = "remetente@mail.com";
$mail->FromName = "Nome do remetente";

$mail->AddAddress('destinatario@mail.com', 'Assunto da mensagem');

//$mail->AddCC('emailpara@copia.com', 'Aqui o nome');
//$mail->AddBCC('emailcomcopia@oculta', 'Aqui o nome');

$mail->IsHTML(true);
$mail->CharSet = 'utf-8';

$mail->Subject = "Assunto da Mensagem"; // Assunto da mensagem
$mail->Body = "Mensagem";


// Anexos
//$mail->AddAttachment("caminho/para/arquivo.pdf", "novo_nome.pdf");

$enviado = $mail->Send();

$mail->ClearAllRecipients();
$mail->ClearAttachments();

if ($enviado) {
    echo "E-mail enviado com sucesso!";
} else {
    echo "Não foi possível enviar o e-mail.";
    echo "Informações do erro:" . $mail->ErrorInfo;
}