WAMP环境下PHP mail()函数无法发送邮件的问题求助

问题概述 #

花费1天多时间配置php.ini和sendmail.ini后，PHP的mail()函数仍无法正常运行，报错信息如下：

Warning: mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in C:\wamp64\www\test-mail.php

以下是相关代码及配置文件：

test.php代码 #

<?php
$to = "mymail@gmail.com";
$subject = "Utilisation de mail()";
$message = "Salut, comment ça va";

$headers =  'From: mymail@gmail.com'. "\r\n" .
            'MIME-Version: 1.0' . "\r\n";
            'Content-type: text/html; charset=utf-8';
           

if(mail($to,$subject,$message,$headers)){
    echo 'Envoye !';
}else{    echo 'Erreur envoi';}

php.ini (v8.2) 邮件配置段 #

[mail function]
; For Win32 only.
; https://php.net/smtp
SMTP = 
; https://php.net/smtp-port
smtp_port = 25

; For Win32 only.
; https://php.net/sendmail-from
;sendmail_from ="admin@wampserver.invalid"

; For Unix only.  You may supply arguments as well (default: "sendmail -t -i").
; https://php.net/sendmail-path
sendmail_path = "C:/wamp64/bin/sendmail/sendmail.exe -t"

; Force the addition of the specified parameters to be passed as extra parameters
; to the sendmail binary. These parameters will always replace the value of
; the 5th parameter to mail().
;mail.force_extra_parameters =

; Add X-PHP-Originating-Script: that will include uid of the script followed by the filename
mail.add_x_header = Off

; Use mixed LF and CRLF line separators to keep compatibility with some
; RFC 2822 non conformant MTA.
mail.mixed_lf_and_crlf = Off

; The path to a log file that will log all mail() calls. Log entries include
; the full path of the script, line number, To address and headers.
;mail.log =
; Log mail to syslog (Event Log on Windows).
;mail.log = syslog

sendmail.ini配置 #

[sendmail]

; you must change mail.mydomain.com to your smtp server,
; or to IIS's "pickup" directory.  (generally C:\Inetpub\mailroot\Pickup)
; emails delivered via IIS's pickup directory cause sendmail to
; run quicker, but you won't get error messages back to the calling
; application.

smtp_server=smtp.gmail.com

; smtp port (normally 25)

smtp_port=465

; SMTPS (SSL) support
;   auto = use SSL for port 465, otherwise try to use TLS
;   ssl  = alway use SSL
;   tls  = always use TLS
;   none = never try to use SSL

smtp_ssl=ssl

; the default domain for this server will be read from the registry
; this will be appended to email addresses when one isn't provided
; if you want to override the value in the registry, uncomment and modify

default_domain=localhost

; log smtp errors to error.log (defaults to same directory as sendmail.exe)
; uncomment to enable logging

error_logfile=error.log

; create debug log as debug.log (defaults to same directory as sendmail.exe)
; uncomment to enable debugging

debug_logfile=debug.log

; if your smtp server requires authentication, modify the following two lines

auth_username=mymail@gmail.com
auth_password=(Google PIN)


; if your smtp server uses pop3 before smtp authentication, modify the 
; following three lines.  do not enable unless it is required.

pop3_server=
pop3_username=
pop3_password=

; force the sender to always be the following email address
; this will only affect the "MAIL FROM" command, it won't modify 
; the "From: " header of the message content

force_sender=mymail@gmail.com

解决方案 #

1. 修正php.ini的Windows SMTP配置 #

错误提示显示PHP尝试连接localhost:25，是因为Windows下PHP默认优先使用内置SMTP客户端，而非sendmail.exe。修改php.ini的Win32相关配置：

[mail function]
; For Win32 only.
SMTP = smtp.gmail.com
smtp_port = 465
sendmail_from = "mymail@gmail.com"

; 保留sendmail_path，若要强制使用sendmail.exe，需确保路径正确（用正斜杠或双反斜杠）
sendmail_path = "C:/wamp64/bin/sendmail/sendmail.exe -t -i"

2. 修复PHP代码的headers语法错误 #

你的$headers赋值存在语法问题，第三行的Content-type未与前面内容用.连接，导致该header未被正确添加：

$headers =  'From: mymail@gmail.com'. "\r\n" .
            'MIME-Version: 1.0' . "\r\n" .
            'Content-type: text/html; charset=utf-8';

3. 验证Gmail SMTP权限 #

使用Gmail SMTP需确认：

• 应用专用密码（Google PIN）有效，且对应你的邮箱账号
• 账号开启两步验证后生成的专用密码，而非普通登录密码
• 网络可访问smtp.gmail.com:465，可通过命令提示符执行telnet smtp.gmail.com 465测试连接

4. 查看sendmail日志定位细节 #

sendmail.ini已开启日志，前往C:\wamp64\bin\sendmail\查看error.log和debug.log，日志会记录具体失败原因（如认证错误、SSL问题等），便于精准排查。

5. 替代方案：使用PHPMailer #

若原生配置仍无法解决，推荐使用PHPMailer替代mail()函数，稳定性更强且配置直观：

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

require 'path/to/PHPMailer/src/Exception.php';
require 'path/to/PHPMailer/src/PHPMailer.php';
require 'path/to/PHPMailer/src/SMTP.php';

$mail = new PHPMailer(true);

try {
    // 服务器配置
    $mail->SMTPDebug = SMTP::DEBUG_OFF;
    $mail->isSMTP();
    $mail->Host       = 'smtp.gmail.com';
    $mail->SMTPAuth   = true;
    $mail->Username   = 'mymail@gmail.com';
    $mail->Password   = '你的Google应用专用密码';
    $mail->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;
    $mail->Port       = 465;

    // 收件人
    $mail->setFrom('mymail@gmail.com', '发送者名称');
    $mail->addAddress('mymail@gmail.com');

    // 邮件内容
    $mail->isHTML(true);
    $mail->Subject = 'Utilisation de mail()';
    $mail->Body    = 'Salut, comment ça va';

    $mail->send();
    echo 'Envoye !';
} catch (Exception $e) {
    echo "Erreur envoi: {$mail->ErrorInfo}";
}

内容的提问来源于stack exchange，提问作者JoKa