Three kinds of php send mail instance program

if (Send_mail (' test@qq.com ', ' mail subject ', ' message content ') = = "") {
echo "Send success!" <br> ";
} else{
echo "Send failed! <br> ";
}

<?php
$to = "test@test.com";
$subject = "Test subject";
$message = "This is the test email.";
$from = "youremail@yourdomain.com";
$headers = "From: $from";
Mail ($to, $subject, $message, $headers);
?>

<?php
function Send_mail ($to, $subject = ' No subject ', $body) {
$loc _host = "im286"; The computer name of the letter, can be arbitrary
$SMTP _ACC = "test@126.com"; SMTP Authenticated user name
$smtp _pass= "Hu Jintao"; SMTP authenticated password, generally equivalent to POP3 password
$SMTP _host= "smtp.126.com"; SMTP server address, similar to smtp.tom.com
$from = "test@126.com"; Email address of sender, your letter-mail address
$headers = "Content-type:text/plain; charset= "Utf-8" content-transfer-encoding:base64 ";
$lb = ""; LineBreak

$hdr =explode ($lb, $headers); Parsed HDR
if ($body) {$bdy = Preg_replace ("/^./", "...", Explode ($lb, $body)); After parsing the body

$SMTP = Array (
1, EHLO, look forward to return 220 or 250
Array ("EHLO". $loc _host. $lb, "220,250", "HELO Error:"),
2, send Auth Login, look forward to return 334
Array ("AUTH LOGIN". $lb, "334", "AUTH Error:"),
3, send after BASE64 encoded username, look forward to return 334
Array (Base64_encode ($smtp _acc). $lb, "334", "Authentification Error:"),
4, send the password after BASE64 encoded, look forward to return 235
Array (Base64_encode ($smtp _pass). $lb, "235", "Authentification Error:");
5, send mail from, look forward to return 250
$SMTP [] = Array ("MAIL from: <". $from. " > ". $lb," A "," MAIL from Error: ");
6, send rcpt to. Expect to return 250
$SMTP [] = Array ("RCPT to: <". $to. " > ". $lb," RCPT "," to Error: ");
7, send data, look forward to return 354
$SMTP [] = Array ("Data". $LB, "354", "Data error:");
8.0. Send from
$SMTP [] = Array (from: ". $from. $lb," "," ");
8.2, Send To
$SMTP [] = Array ("To:". $to. $lb, "", "");
8.1, send the title
$SMTP [] = Array ("Subject:". $subject. $lb, "", "");
8.3, send other header content
foreach ($hdr as $h) {$SMTP [] = Array ($h. $lb, "", "");}
8.4, send a blank line, end header send
$SMTP [] = Array ($lb, "", "");
8.5, send the letter subject
if ($bdy) {foreach ($bdy as $b) {$SMTP [] = Array (Base64_encode ($b. $lb). $lb, "", "");}}
9, send "." Indicates the end of the letter, expecting to return 250
$SMTP [] = Array ("."). $LB, "The", "DATA (end) Error:");
10, send quit, exit, look forward to return 221
$SMTP [] = Array ("QUIT". $lb, "221", "QUIT Error:");

Open the SMTP server port
$fp = @fsockopen ($smtp _host, 25);
if (! $fp) echo "<b>Error:</b> cannot conect to". $smtp _host. " <br> ";
while ($result = @fgets ($fp, 1024)) {if (substr ($result, 3,1) = = "") {Break;}}

$result _str= "";
Send commands/Data in an SMTP array
foreach ($smtp as $req) {
Send a message
@fputs ($fp, $req [0]);
If a receive server returns information is required, the
if ($req [1]) {
Receive information
while ($result = @fgets ($fp, 1024)) {
if (substr ($result, 3,1) = = "") {break;}
};
if (!strstr ($req [1],substr ($result, 0, 3)) {
$result _str.= $req [2]. $result. " <br> ";
}
}
}
Close connection
@fclose ($FP);
return $result _str;
}
?>