以前见到的PHP邮件功能，不错还是不错的。

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/* Pop3 Functions.
Smtp Functions. [Added later, going to split]

For a real example take a look at:
http://www.triple-it.nl/pop3/

I have just started to explore the world of PHP3,
so excuse (and correct me :) if I'm doing something wrong.

Unk. (rgroesb@triple-it.nl)
*/

function pop3_open($server, $port)
{
global $POP3_GLOBAL_STATUS;

$pop3 = fsockopen($server, $port);
if ($pop3

    $line = fgets($pop3, 1024);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] = substr($line, 0, 1);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] "+") return 0;

return $pop3;
}

function pop3_user($pop3, $user)
{
global $POP3_GLOBAL_STATUS;

    fputs($pop3, "USER $user\r\n");
    $line = fgets($pop3, 1024);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] = substr($line, 0, 1);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULTTXT"] = substr($line, 0, 1024);

    if ($POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] "+") return 0;

return 1;
}

function pop3_pass($pop3, $pass)
{
global $POP3_GLOBAL_STATUS;

    fputs($pop3, "PASS $pass\r\n");
    $line = fgets($pop3, 1024);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] = substr($line, 0, 1);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULTTXT"] = substr($line, 0, 1024);

    if ($POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] "+") return 0;

    return 1;
}

function pop3_stat($pop3)
{
    global $POP3_GLOBAL_STATUS;

    fputs($pop3, "STAT\r\n");
    $line = fgets($pop3, 1024);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] = substr($line, 0, 1);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] "+") return 0;

if (!eregi("+OK (.*) (.*)", $line, $regs))
return 0;

return $regs[1];
}

function pop3_list($pop3)
{
        global $POP3_GLOBAL_STATUS;

        fputs($pop3, "LIST\r\n");
        $line = fgets($pop3, 1024);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] = substr($line, 0, 1);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] "+") return 0;

    $i = 0;
    while (substr($line = fgets($pop3, 1024), 0, 1) ".")
    {
        $articles[$i] = $line;
        $i++;
    }
    $articles["count"] = $i;

return $articles;
}

function pop3_retr($pop3, $nr)
{
        global $POP3_GLOBAL_STATUS;

        fputs($pop3, "RETR $nr\r\n");
        $line = fgets($pop3, 1024);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] = substr($line, 0, 1);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] "+") return 0;

        while (substr($line = fgets($pop3, 1024), 0, 1) ".")
        {
                $data[$i] = $line;
                $i++;
        }
        $data["count"] = $i;

return $data;
}

function pop3_dele($pop3, $nr)
{
global $POP3_GLOBAL_STATUS;

        fputs($pop3, "DELE $nr\r\n");
        $line = fgets($pop3, 1024);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] = substr($line, 0, 1);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] "+") return 0;

return 1;
}

function pop3_quit($pop3)
{
global $POP3_GLOBAL_STATUS;

        fputs($pop3, "QUIT\r\n");
        $line = fgets($pop3, 1024);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] = substr($line, 0, 1);
        $POP3_GLOBAL_STATUS[$pop3]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($POP3_GLOBAL_STATUS[$pop3]["LASTRESULT"] "+") return 0;

return 1;
}

function smtp_open($server, $port)
{
global $SMTP_GLOBAL_STATUS;

$smtp = fsockopen($server, $port);
if ($smtp

        $line = fgets($smtp, 1024);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] = substr($line, 0, 1);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] "2") return 0;

return $smtp;
}

function smtp_helo($smtp)
{
global $SMTP_GLOBAL_STATUS;

    /* 'localhost' always works [Unk] */
        fputs($smtp, "helo localhost\r\n");
        $line = fgets($smtp, 1024);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] = substr($line, 0, 1);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] "2") return 0;

return 1;
}

function smtp_ehlo($smtp)
{
global $SMTP_GLOBAL_STATUS;

    /* Well, let's use "helo" for now.. Until we need the
          extra func's   [Unk]
     */
        fputs($smtp, "helo localhost\r\n");
        $line = fgets($smtp, 1024);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] = substr($line, 0, 1);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] "2") return 0;

return 1;
}

function smtp_mail_from($smtp, $from)
{
global $SMTP_GLOBAL_STATUS;

        fputs($smtp, "MAIL FROM: \r\n");
        $line = fgets($smtp, 1024);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] = substr($line, 0, 1);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] "2") return 0;

return 1;
}

function smtp_rcpt_to($smtp, $to)
{
global $SMTP_GLOBAL_STATUS;

        fputs($smtp, "RCPT TO: \r\n");
        $line = fgets($smtp, 1024);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] = substr($line, 0, 1);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] "2") return 0;

return 1;
}

function smtp_data($smtp, $subject, $data)
{
global $SMTP_GLOBAL_STATUS;

        fputs($smtp, "DATA\r\n");
        $line = fgets($smtp, 1024);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] = substr($line, 0, 1);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] "3") return 0;

    fputs($smtp, "Mime-Version: 1.0\r\n");
    fputs($smtp, "Subject: $subject\r\n");
    fputs($smtp, "$data\r\n\r\n");
    fputs($smtp, ".\r\n");
        $line = fgets($smtp, 1024);
    if (substr($line, 0, 1) "2")
        return 0;

return 1;
}

function smtp_quit($smtp)
{
global $SMTP_GLOBAL_STATUS;

        fputs($smtp, "QUIT\r\n");
        $line = fgets($smtp, 1024);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] = substr($line, 0, 1);
        $SMTP_GLOBAL_STATUS[$smtp]["LASTRESULTTXT"] = substr($line, 0, 1024);

if ($SMTP_GLOBAL_STATUS[$smtp]["LASTRESULT"] "2") return 0;

return 1;
}

/*
$pop3 = pop3_open("localhost", "110");
if (!$pop3) {
    printf("[ERROR] Failed to connect to localhost
\n");
    return 0;
}

if (!pop3_user($pop3, "unk")) {
    printf("[ERROR] Username failed!
\n");
    return 0;
}

if (!pop3_pass($pop3, "secret")) {
    printf("[ERROR] PASS failed!
\n");
    return 0;
}

$articles = pop3_list($pop3);
if (!$articles) {
    printf("[ERROR] LIST failed!
\n");
    return 0;
}

for ($i = 1; $i {
    printf("i=$i
\n");
    $data = pop3_retr($pop3,$i);
    if (!$data) {
        printf("data goes wrong on '$i'
\n");
        return 0;
    }

    for ($j = 0; $j     {
        printf("$data[$j]
\n");
    }
}
*/

?>

以前见到的PHP邮件功能，不错还是不错的。_PHP