如何解决PHP mail无法正常工作，但未返回错误
我一直在尝试通过PHP发送邮件，在阅读了tutos和论坛之后，我仍然做不到，这是我的配置以及我尝试过的操作：
centos 7
php 7.4.6
php.ini mail（）：
[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = localhost
; http://php.net/smtp-port
smtp_port = 25
; For Win32 only.
; http://php.net/sendmail-from
sendmail_from = test.exemple@gmail.com
; For Unix only. You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
sendmail_path = /usr/sbin/sendmail -t -i
sendmail_from = me@myserver.com
我已经安装了sendmail，我可以这样通过控制台发送邮件：
mail ('mon.mail@gmail.com',"Test email","test simple",null,"-f autre.mail@gmail.com");
这是邮件日志
[root@dockertest /]# tail /var/log/maillog
Aug 12 15:42:08 dockertest sendmail[84407]: 07CDg8xw084407: from=root,size=99,class=0,nrcpts=1,msgid=<202008121342.07CDg8xw084407@dockertest.cable.mr.local>,relay=root@localhost
Aug 12 15:42:08 dockertest postfix/smtpd[84408]: connect from localhost[127.0.0.1]
Aug 12 15:42:08 dockertest postfix/smtpd[84408]: 89054859389: client=localhost[127.0.0.1]
Aug 12 15:42:08 dockertest postfix/cleanup[84411]: 89054859389: message-id=<202008121342.07CDg8xw084407@dockertest.cable.mr.local>
Aug 12 15:42:08 dockertest sendmail[84407]: 07CDg8xw084407: to=mon.mail.com,ctladdr=root (0/0),delay=00:00:00,xdelay=00:00:00,mailer=relay,pri=30099,relay=[127.0.0.1] [127.0.0.1],dsn=2.0.0,stat=Sent (Ok: queued as 89054859389)
Aug 12 15:42:08 dockertest postfix/qmgr[1583]: 89054859389: from=<root@dockertest.cable.mr.local>,size=601,nrcpt=1 (queue active)
Aug 12 15:42:08 dockertest postfix/smtpd[84408]: disconnect from localhost[127.0.0.1]
Aug 12 15:42:08 dockertest postfix/smtp[84412]: connect to gmail-smtp-in.l.google.com[2a00:1450:400c:c0c::1b]:25: Network is unreachable
Aug 12 15:42:09 dockertest postfix/smtp[84412]: 89054859389: to=<mon.mail.com>,relay=gmail-smtp-in.l.google.com[108.177.15.26]:25,delay=0.82,delays=0.08/0.02/0.22/0.49,status=sent (250 2.0.0 OK 1597239729 k17si1693312wrd.443 - gsmtp)
Aug 12 15:42:09 dockertest postfix/qmgr[1583]: 89054859389: removed
我测试了一些代码，它们没有返回任何错误，但是没有用
<?php
// the message
$msg = "Line of text";
// send email
if(!mail("mon.mail@gmail.com","My subject",$msg)){
var_dump(error_get_last()['message']);
}
?>
和另一个带有标题的
<?php
$to = "mon.mail@gmail.com";
$subject = "HTML email";
$message = "
<html>
<head>
<title>HTML email</title>
</head>
<body>
<p>This email contains HTML Tags!</p>
<table>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
</tr>
</table>
</body>
</html>
";
// Always set content-type when sending HTML email
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
// More headers
$headers .= 'From: <webmaster@example.com>' . "\r\n";
$headers .= 'Cc: myboss@example.com' . "\r\n";
mail($to,$subject,$message,$headers);
?>
我不知道我的配置或代码是否错误，请告诉我是否需要更多信息。
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