在实际项目中，我们会遇到这样的需求，把用户的留言以邮件的方式发送到指定邮箱中。该如何实现？
本文以PHP为例，代码来自一位不知名的大佬，本文重在引用，废话不多说，直接上代码：
mai.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>PHP利用smtp类发送邮件范例</title> </head> <body> <form action="sendmail.php" method="post"> <p>收件人：<input type="text" name="toemail" /></p> <p>标 题：<input type="text" name="title" /></p> <p>内 容：<textarea name="content" cols="50" rows="5"></textarea></p> <p><input type="submit" value="发送" /></p> </form> </body> </html>
sendmai.php
<?php require_once "Smtp.class.php"; //******************** 配置信息 ******************************** $smtpserver = "smtp.163.com";//SMTP服务器 $smtpserverport =25;//SMTP服务器端口 $smtpusermail = "xxxxx@163.com";//SMTP服务器的用户邮箱 $smtpemailto = $_POST['toemail'];//发送给谁 $smtpuser = "xxxx";//SMTP服务器的用户帐号，注：部分邮箱只需@前面的用户名 $smtppass = "********";//SMTP服务器的用户密码 $mailtitle = $_POST['title'];//邮件主题 $mailcontent = "<h1>".$_POST['content']."</h1>";//邮件内容 $mailtype = "HTML";//邮件格式（HTML/TXT）,TXT为文本邮件 //************************ 配置信息 **************************** $smtp = new Smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppass);//这里面的一个true是表示使用身份验证,否则不使用身份验证. $smtp->debug = false;//是否显示发送的调试信息 $state = $smtp->sendmail($smtpemailto, $smtpusermail, $mailtitle, $mailcontent, $mailtype); echo "<div style='300px; margin:36px auto;'>"; if($state==""){ echo "对不起，邮件发送失败！请检查邮箱填写是否有误。"; echo "<a href='index.html'>点此返回</a>"; exit(); } echo "恭喜！邮件发送成功！！"; echo "<a href='index.html'>点此返回</a>"; echo "</div>"; ?>
Smtp.class.php
<?php /** * email smtp （support php7） * * Modified by: Reson 2017/06 * UPDATE: * 1、change ereg to preg_match；change ereg_replace to preg_replace. * 2、change var to public/private. * * More: http://www.daixiaorui.com * */ class Smtp { /* Public Variables */ public $smtp_port; public $time_out; public $host_name; public $log_file; public $relay_host; public $debug; public $auth; public $user; public $pass; /* Private Variables */ private $sock; /* Constractor */ function __construct($relay_host = "", $smtp_port = 25,$auth = false,$user,$pass) { $this->debug = FALSE; $this->smtp_port = $smtp_port; $this->relay_host = $relay_host; $this->time_out = 30; //is used in fsockopen() $this->auth = $auth;//auth $this->user = $user; $this->pass = $pass; $this->host_name = "localhost"; //is used in HELO command $this->log_file = ""; $this->sock = FALSE; } /* Main Function */ function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "") { $mail_from = $this->get_address($this->strip_comment($from)); $body = preg_replace("/(^|( ))(.)/", "1.3", $body); $header = "MIME-Version:1.0 "; if($mailtype=="HTML"){ $header .= "Content-Type:text/html "; } $header .= "To: ".$to." "; if ($cc != "") { $header .= "Cc: ".$cc." "; } $header .= "From: $from<".$from."> "; $header .= "Subject: ".$subject." "; $header .= $additional_headers; $header .= "Date: ".date("r")." "; $header .= "X-Mailer:By Redhat (PHP/".phpversion().") "; list($msec, $sec) = explode(" ", microtime()); $header .= "Message-ID: <".date("YmdHis", $sec).".".($msec*1000000).".".$mail_from."> "; $TO = explode(",", $this->strip_comment($to)); if ($cc != "") { $TO = array_merge($TO, explode(",", $this->strip_comment($cc))); } if ($bcc != "") { $TO = array_merge($TO, explode(",", $this->strip_comment($bcc))); } $sent = TRUE; foreach ($TO as $rcpt_to) { $rcpt_to = $this->get_address($rcpt_to); if (!$this->smtp_sockopen($rcpt_to)) { $this->log_write("Error: Cannot send email to ".$rcpt_to." "); $sent = FALSE; continue; } if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) { $this->log_write("E-mail has been sent to <".$rcpt_to."> "); } else { $this->log_write("Error: Cannot send email to <".$rcpt_to."> "); $sent = FALSE; } fclose($this->sock); $this->log_write("Disconnected from remote host "); } return $sent; } /* Private Functions */ function smtp_send($helo, $from, $to, $header, $body = "") { if (!$this->smtp_putcmd("HELO", $helo)) { return $this->smtp_error("sending HELO command"); } //auth if($this->auth){ if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) { return $this->smtp_error("sending HELO command"); } if (!$this->smtp_putcmd("", base64_encode($this->pass))) { return $this->smtp_error("sending HELO command"); } } if (!$this->smtp_putcmd("MAIL", "FROM:<".$from.">")) { return $this->smtp_error("sending MAIL FROM command"); } if (!$this->smtp_putcmd("RCPT", "TO:<".$to.">")) { return $this->smtp_error("sending RCPT TO command"); } if (!$this->smtp_putcmd("DATA")) { return $this->smtp_error("sending DATA command"); } if (!$this->smtp_message($header, $body)) { return $this->smtp_error("sending message"); } if (!$this->smtp_eom()) { return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]"); } if (!$this->smtp_putcmd("QUIT")) { return $this->smtp_error("sending QUIT command"); } return TRUE; } function smtp_sockopen($address) { if ($this->relay_host == "") { return $this->smtp_sockopen_mx($address); } else { return $this->smtp_sockopen_relay(); } } function smtp_sockopen_relay() { $this->log_write("Trying to ".$this->relay_host.":".$this->smtp_port." "); $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out); if (!($this->sock && $this->smtp_ok())) { $this->log_write("Error: Cannot connenct to relay host ".$this->relay_host." "); $this->log_write("Error: ".$errstr." (".$errno.") "); return FALSE; } $this->log_write("Connected to relay host ".$this->relay_host." "); return TRUE; } function smtp_sockopen_mx($address) { $domain = preg_replace("/^.+@([^@]+)$/", "1", $address); if (!@getmxrr($domain, $MXHOSTS)) { $this->log_write("Error: Cannot resolve MX "".$domain."" "); return FALSE; } //专注与php学习 http://www.daixiaorui.com 欢迎您的访问 foreach ($MXHOSTS as $host) { $this->log_write("Trying to ".$host.":".$this->smtp_port." "); $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out); if (!($this->sock && $this->smtp_ok())) { $this->log_write("Warning: Cannot connect to mx host ".$host." "); $this->log_write("Error: ".$errstr." (".$errno.") "); continue; } $this->log_write("Connected to mx host ".$host." "); return TRUE; } $this->log_write("Error: Cannot connect to any mx hosts (".implode(", ", $MXHOSTS).") "); return FALSE; } function smtp_message($header, $body) { fputs($this->sock, $header." ".$body); $this->smtp_debug("> ".str_replace(" ", " "."> ", $header." > ".$body." > ")); return TRUE; } function smtp_eom() { fputs($this->sock, " . "); $this->smtp_debug(". [EOM] "); return $this->smtp_ok(); } function smtp_ok() { $response = str_replace(" ", "", fgets($this->sock, 512)); $this->smtp_debug($response." "); if (!preg_match("/^[23]/", $response)) { fputs($this->sock, "QUIT "); fgets($this->sock, 512); $this->log_write("Error: Remote host returned "".$response."" "); return FALSE; } return TRUE; } function smtp_putcmd($cmd, $arg = "") { if ($arg != "") { if($cmd=="") $cmd = $arg; else $cmd = $cmd." ".$arg; } fputs($this->sock, $cmd." "); $this->smtp_debug("> ".$cmd." "); return $this->smtp_ok(); } function smtp_error($string) { $this->log_write("Error: Error occurred while ".$string.". "); return FALSE; } function log_write($message) { $this->smtp_debug($message); if ($this->log_file == "") { return TRUE; } $message = date("M d H:i:s ").get_current_user()."[".getmypid()."]: ".$message; if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) { $this->smtp_debug("Warning: Cannot open log file "".$this->log_file."" "); return FALSE; } flock($fp, LOCK_EX); fputs($fp, $message); fclose($fp); return TRUE; } function strip_comment($address) { $comment = "/([^()]*)/"; while (preg_match($comment, $address)) { $address = preg_replace($comment, "", $address); } return $address; } function get_address($address) { $address = preg_replace("/([ ])+/", "", $address); $address = preg_replace("/^.*<(.+)>.*$/", "1", $address); return $address; } function smtp_debug($message) { if ($this->debug) { echo $message; } } }
注意问题：在本地使用过程中，代码完全可以发送，并实现功能，但部署到服务器中，发现一直报错：
1、以163邮箱为例，将以下配置修改为
$smtpserver = "ssl://smtp.163.com";//SMTP服务器 $smtpserverport =465;//SMTP服务器端口
2、如果运用的是阿里云虚拟主机的话，默认是禁用 PHP函数fsockopen设置的， 必须要手动开启，否则也是直接无法连接邮箱服务
如图：