Как узнать ошибку mail php

<?php
$headers = 'Content-Type: text/plain; charset=utf-8' . "rn";
?>

Mostly, UTF-8 is your best choice.

You can set custom headers with the fourth parameter of the mail() function.

To make the whole thing waterproof, add the following header too:

<?php
$headers .= 'Content-Transfer-Encoding: base64' . "rn";
?>

Now you can use the combination of UTF-8 and Base64 to properly encode the subject line and the recipient name like this:

<?php
$subject = '=?UTF-8?B?' . base64_encode('Test email with German Umlauts öäüß') . '?=';
$recipient = '=?UTF-8?B?' . base64_encode('Margret Müller') . '?= <recipient@domain.com>';
?>

And don't forget to Base64 encode the email message too:

<?php
$message = base64_encode('This email contains German Umlauts öäüß.');
?>

All references are taken from:
https://dev.to/lutvit/how-to-make-the-php-mail-function-awesome-3cii

The crucial part is the $additional_headers parameter. This parameter can't be cleaned by the mail() function. So it is up to you to prevent unwanted r or n to be inserted into the values you put in there. Otherwise you just created a potential spam distributor.

<?php
$success = mail('example@example.com', 'My Subject', $message);
if (!$success) {
    $errorMessage = error_get_last()['message'];
}
?>

(Tested successfully on Windows which uses SMTP by default, but sendmail on Linux/OSX may not provide the same level of detail.)

Thanks to https://stackoverflow.com/a/20203870/195835

function xxmail($to, $subject, $body, $headers)
{
$smtp = stream_socket_client('tcp://smtp.yourmail.com:25', $eno, $estr, 30);

$B = 8192;
$c = "rn";
$s = 'myapp@someserver.com';

fwrite($smtp, 'helo ' . $_ENV['HOSTNAME'] . $c);
  $junk = fgets($smtp, $B);

// Envelope
fwrite($smtp, 'mail from: ' . $s . $c);
  $junk = fgets($smtp, $B);
fwrite($smtp, 'rcpt to: ' . $to . $c);
  $junk = fgets($smtp, $B);
fwrite($smtp, 'data' . $c);
  $junk = fgets($smtp, $B);

// Header
fwrite($smtp, 'To: ' . $to . $c);
if(strlen($subject)) fwrite($smtp, 'Subject: ' . $subject . $c);
if(strlen($headers)) fwrite($smtp, $headers); // Must be rn (delimited)
fwrite($smtp, $headers . $c);

// Body
if(strlen($body)) fwrite($smtp, $body . $c);
fwrite($smtp, $c . '.' . $c);
  $junk = fgets($smtp, $B);

// Close
fwrite($smtp, 'quit' . $c);
  $junk = fgets($smtp, $B);
fclose($smtp);
}

This executable is a standard, and emulated by other MTAs.

"n" is confirmed required for qmail and postfix, probably also for sendmail and exim but I have not tested.

If you pass through using "rn" as a separator it may appear to work, but your email will be subtly corrupted and some middleware may break. It only works because some systems will clean up your mistake.

If you are implementing DKIM be very careful, as DKIM checks will fail (at least on popular validation tools) if you screw this up. DKIM must be calculated using "rn" but then you must switch it all to "n" when using the PHP mail function.

On Windows, however, you should use "rn" because PHP is using SMTP in this situation, and hence the normal rules of the SMTP protocol (not the normal rules of Unix piping) apply.

function sendMail(
    string $fileAttachment,
    string $mailMessage = MAIL_CONF["mailMessage"],
    string $subject     = MAIL_CONF["subject"],
    string $toAddress   = MAIL_CONF["toAddress"],
    string $fromMail    = MAIL_CONF["fromMail"]
): bool {

        $fileAttachment = trim($fileAttachment);
    $from           = $fromMail;
    $pathInfo       = pathinfo($fileAttachment);
    $attchmentName  = "attachment_".date("YmdHms").(
    (isset($pathInfo['extension']))? ".".$pathInfo['extension'] : ""
    );

        $attachment    = chunk_split(base64_encode(file_get_contents($fileAttachment)));
    $boundary      = "PHP-mixed-".md5(time());
    $boundWithPre  = "n--".$boundary;

        $headers   = "From: $from";
    $headers  .= "nReply-To: $from";
    $headers  .= "nContent-Type: multipart/mixed; boundary="".$boundary.""";

        $message   = $boundWithPre;
    $message  .= "n Content-Type: text/plain; charset=UTF-8n";
    $message  .= "n $mailMessage";

        $message .= $boundWithPre;
    $message .= "nContent-Type: application/octet-stream; name="".$attchmentName.""";
    $message .= "nContent-Transfer-Encoding: base64n";
    $message .= "nContent-Disposition: attachmentn";
    $message .= $attachment;
    $message .= $boundWithPre."--";

        return mail($toAddress, $subject, $message, $headers);
}

* Sending email in html

function sendHtmlMail(
    string $mailMessage = MAIL_CONF["mailMessage"],
    string $subject     = MAIL_CONF["subject"],
    array $toAddress    = MAIL_CONF["toAddress"],
    string $fromMail    = MAIL_CONF["fromMail"]
): bool {

        $to        = implode(",", $toAddress);
    $headers[] = 'MIME-Version: 1.0';
    $headers[] = 'Content-type: text/html; charset=iso-8859-1';   
    $headers[] = 'To: '.$to;
    $headers[] = 'From: '.$fromMail;   

    return mail($to, $subject, $mailMessage, implode("rn", $headers));
}

Despite the comment in that file, sendmail_path also works for Window. From https://www.php.net/manual/en/mail.configuration.php#ini.sendmail-path:

This directive works also under Windows. If set, smtp, smtp_port and sendmail_from are ignored and the specified command is executed.

<?php
    $encoding = "utf-8";// Preferences for Subject field
    $subject_preferences = array(
        "input-charset" => $encoding,
        "output-charset" => $encoding,
        "line-length" => 76,
        "line-break-chars" => "rn"
    );// Mail header
    $header = "Content-type: text/html; charset=".$encoding." rn";
    $header .= "From: ".$from_name." <".$from_mail."> rn";
    $header .= "MIME-Version: 1.0 rn";
    $header .= "Content-Transfer-Encoding: 8bit rn";
    $header .= "Date: ".date("r (T)")." rn";
    $header .= iconv_mime_encode("Subject", $mail_subject, $subject_preferences);// Send mail
    mail($mail_to, $mail_subject, $mail_message, $header);
?>

1) The domain in the email used in the -f option in the php.ini sendmail parameter or in the mail() extra parameters field, needs to have a valid SPF record for the domain (in DNS as a "TXT" record type for sure and add an additional  "SPF" type record if possible).  Why? That's header field being used for spam checks.

2) You should also use a domain key or DKIM.  The trick here is that the domain key/DKIM is case sensitive!  I used Cpanel to create my domain key which automatically used all lowercase domain names in the key creation.  I found when  sending email and using a camel case "-f account@MyDomainHere.Com" option, my key was not accepted.  However it was accepted when I used "-f account@mydomainhere.com".

There are many other factors that can contribute to mail not getting to inboxes, including your own multiple failed testing attempts, so I suggest you consult each site's guidelines and don't ask me for help.  These are just the couple technical issues that helped my case.

I hope this saves someone some time and headaches...

The upshot of all this is that on a Windows system your  message and headers must use the standard line endings rn as prescribed by the email specs. On a UNIX system the MTA's "sendmail" interface assumes that recieved data will use UNIX line endings and will turn any n to rn, so you must supply only n to mail() on a UNIX system to avoid the MTA hypercorrecting to rrn.

If you use plain old n on a Windows system, some MTAs will get a little upset. qmail in particular will refuse outright to accept any message that has a lonely n without an accompanying r.

<?php $subject = '=?utf-8?B?' . base64_encode($subject) . '?='; ?>

But with very long subjects, the header line gets longer than 76 chars and some e-mail servers really don't like that... So this is my new solution:

<?php $subject = substr(mb_encode_mimeheader("Subject: " . $subject, 'utf-8', 'B', "rn", 0), 9); ?>

Please note: I added "Subject: " in front of $subject and stripped it of afterwards. This is to make sure, that the necessarry space is reserved, as PHP will add the "Subject: " itself...

doing some tests i can say... if sendmail_path is defined in php.ini or by ini.set(), by calling function like...

mail($to, $subject, $message, $headers, $params)

would be like if php open a shell internally, execute this command, send this text to stdin, and return true if return value == 0

------------
shell> $sendmail_path $params
To: $to
Subject: $subject
$headers

$message
(EOF)
------------

in windows instead using php smtp which is very limited, i prefer to force use sendmail-like behavior, by setting sendmail_path and then use msmtp for windows

For example, this didn't work on our servers:

$headers = "From: $from rn Bcc: $bcc rn";

But this did:

$headers = "From: $fromrnBcc: $bccrn";

Notice the removal of the spaces around the first rn.

<?php
function mail_utf8($to, $from_user, $from_email,
                                             $subject = '(No subject)', $message = '')
   {
      $from_user = "=?UTF-8?B?".base64_encode($from_user)."?=";
      $subject = "=?UTF-8?B?".base64_encode($subject)."?=";$headers = "From: $from_user <$from_email>rn".
               "MIME-Version: 1.0" . "rn" .
               "Content-type: text/html; charset=UTF-8" . "rn";

     return

mail($to, $subject, $message, $headers);
   }
?>

<?php
        $headers = "MIME-Version: 1.0n" ;
        $headers .= "Content-Type: text/html; charset="iso-8859-1"n";$headers .= "Sensitivity: Personaln";$status   = mail($to, $subject, $message,$headers);
?>

Possible Options:
Sensitivity: Normal, Personal, Private and Company-Confidential

These will be recognised and handled in Outlook, Thunderbird and others.

be careful not to duplicate To in the additional_headers,

lest gmail already flags it thus:

host gmail-smtp-in.l.google.com [142.251.xx.xx]
SMTP error from remote mail server after end of data:
550-5.7.1 [xxx.xxx.xx.xx] This message is not RFC 5322 compliant, the issue is:
550-5.7.1 duplicate To headers. To reduce the amount of spam sent to Gmail,
550-5.7.1 this message has been blocked. Please review
550 5.7.1 RFC 5322 specifications for more information.