Php 由于邮件错误，无法注册到我的应用程序

我正试图在swift3中为iOS制作一个应用程序，但当我尝试注册时，我收到了一个邮件错误（为了完成注册，我使用电子邮件激活链接进行了注册）

register.php

    // include email.php
require ("secure/email.php");

// store all class in $email var
$email = new email();

// store generated token in $token var
$token = $email->generateToken(20);

// save inf in 'emailTokens' table
$access->saveToken("emailTokens", $user["id"], $token);

// refer emailing information
$details = array();
$details["subject"] = "Email confirmation on Twitter";
$details["to"] = $user["email"];
$details["fromName"] = "Akhmed Idigov";
$details["fromEmail"] = "akhmedidigov@gmail.com";

// access template file
$template = $email->confirmationTemplate();

// replace {token} from confirmationTemplate.html by $token and store all content in $template var
$template = str_replace("{token}", $token, $template);

$details["body"] = $template;

$email->sendEmail($details);


  } else {
   $returnArray["status"] = "400";
   $returnArray["message"] = "Could not register with provided 
     infomraiton";
     }

class email {


// Generate unique token for user when he got confirmation email message
function generateToken($length) {

    // some characters
    $characters = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890";

    // get length of characters string
    $charactersLength= strlen($characters);

    $token = '';

    // generate random char from $characters every time until it is less than $charactersLength
    for ($i = 0; $i < $length; $i++) {
        $token .= $characters[rand(0, $charactersLength-1)];
    }

    return $token;

}


// Open confirmation template user gonna receive
function confirmationTemplate() {

    // open file
    $file = fopen("templates/confirmationTemplate.html", "r") or die("Unable to open file");

    // store content of file in $template var
    $template = fread($file, filesize("templates/confirmationTemplate.html"));

    fclose($file);

    return $template;

}


// Open confirmation template user gonna receive
function resetPasswordTemplate() {

    // open file
    $file = fopen("templates/resetPasswordTemplate.html", "r") or die("Unable to open file");

    // store content of file in $template var
    $template = fread($file, filesize("templates/resetPasswordTemplate.html"));

    fclose($file);

    return $template;

}


// Send email with php
function sendEmail($details) {

    // information of email
    $subject = $details["subject"];
    $to = $details["to"];
    $fromName = $details["fromName"];
    $fromEmail = $details["fromEmail"];
    $body = $details["body"];

    // header required by some of smtp or mail sites
    $headers = "MIME-Version: 1.0" . "\r\n";
    $headers .= "Content-type:text/html;content=UTF-8" . "\r\n";
    $headers .= "From: " . $fromName . " <" . $fromEmail . ">" . "\r\n"; // From Akhmed Idigov <akhmed@gmail.com>

    // php func to send email finaly
    mail($to, $subject, $body, $headers);

}


}



?>

email.php

    // include email.php
require ("secure/email.php");

// store all class in $email var
$email = new email();

// store generated token in $token var
$token = $email->generateToken(20);

// save inf in 'emailTokens' table
$access->saveToken("emailTokens", $user["id"], $token);

// refer emailing information
$details = array();
$details["subject"] = "Email confirmation on Twitter";
$details["to"] = $user["email"];
$details["fromName"] = "Akhmed Idigov";
$details["fromEmail"] = "akhmedidigov@gmail.com";

// access template file
$template = $email->confirmationTemplate();

// replace {token} from confirmationTemplate.html by $token and store all content in $template var
$template = str_replace("{token}", $token, $template);

$details["body"] = $template;

$email->sendEmail($details);


  } else {
   $returnArray["status"] = "400";
   $returnArray["message"] = "Could not register with provided 
     infomraiton";
     }

class email {


// Generate unique token for user when he got confirmation email message
function generateToken($length) {

    // some characters
    $characters = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890";

    // get length of characters string
    $charactersLength= strlen($characters);

    $token = '';

    // generate random char from $characters every time until it is less than $charactersLength
    for ($i = 0; $i < $length; $i++) {
        $token .= $characters[rand(0, $charactersLength-1)];
    }

    return $token;

}


// Open confirmation template user gonna receive
function confirmationTemplate() {

    // open file
    $file = fopen("templates/confirmationTemplate.html", "r") or die("Unable to open file");

    // store content of file in $template var
    $template = fread($file, filesize("templates/confirmationTemplate.html"));

    fclose($file);

    return $template;

}


// Open confirmation template user gonna receive
function resetPasswordTemplate() {

    // open file
    $file = fopen("templates/resetPasswordTemplate.html", "r") or die("Unable to open file");

    // store content of file in $template var
    $template = fread($file, filesize("templates/resetPasswordTemplate.html"));

    fclose($file);

    return $template;

}


// Send email with php
function sendEmail($details) {

    // information of email
    $subject = $details["subject"];
    $to = $details["to"];
    $fromName = $details["fromName"];
    $fromEmail = $details["fromEmail"];
    $body = $details["body"];

    // header required by some of smtp or mail sites
    $headers = "MIME-Version: 1.0" . "\r\n";
    $headers .= "Content-type:text/html;content=UTF-8" . "\r\n";
    $headers .= "From: " . $fromName . " <" . $fromEmail . ">" . "\r\n"; // From Akhmed Idigov <akhmed@gmail.com>

    // php func to send email finaly
    mail($to, $subject, $body, $headers);

}


}



?>

class电子邮件{
//当用户收到确认电子邮件时为其生成唯一令牌
函数generateToken（$length）{
//一些人物
$characters=“qwertyuiopasdfghjklzxcvnmqwertyuiopasdfghjklzxcvnm1234567890”；
//获取字符串的长度
$charactersLength=strlen（$characters）；
$token=''；
//每次从$characters生成随机字符，直到它小于$charactersLength
对于（$i=0；$i<$length；$i++）{
$token.=$characters[rand（0，$charactersLength-1）]；
}
返回$token；
}
//打开用户将收到的确认模板
函数确认模板（）{
//打开文件
$file=fopen（“templates/confirmationTemplate.html”，“r”）或die（“无法打开文件”）；
//将文件内容存储在$template var中
$template=fread（$file，filesize（“templates/confirmationTemplate.html”）；
fclose（$文件）；
返回$template；
}
//打开用户将收到的确认模板
函数resetPasswordTemplate（）{
//打开文件
$file=fopen（“templates/resetPasswordTemplate.html”，“r”）或die（“无法打开文件”）；
//将文件内容存储在$template var中
$template=fread（$file，filesize（“templates/resetPasswordTemplate.html”）；
fclose（$文件）；
返回$template；
}
//用php发送电子邮件
发送电子邮件功能（$details）{
//电子邮件信息
$subject=$details[“subject”]；
$to=$details[“to”]；
$fromName=$details[“fromName”]；
$fromEmail=$details[“fromEmail”]；
$body=$details[“body”]；
//某些smtp或邮件站点需要的标头
$headers=“MIME版本：1.0”。\r\n”；
$headers.=“内容类型：text/html；内容=UTF-8”“\r\n”；
$headers.=“From:”$fromName.“\r\n”；//来自Akhmed Idigov
//php func最终发送电子邮件
邮件（$to、$subject、$body、$headers）；
}
}
?>

这是我注册时得到的

---

如果需要，我可以提供任何其他信息。

这似乎与Swift、iOS或Objective-C无关。运行php的macOS服务器上的sendmail存在问题。我应该怎么做，或者在哪里可以找到帮助？我需要尽快解决这个问题。感谢安装支持邮件的服务器？购买支持邮件的主机？我遵循了一个教程，我所做的是编辑/etc/postfix/main.cf文件以添加一些行（relayhost=smtp.gmail.com:587/smtp_sasl_auth_enable=yes和其他行）。。。奇怪的是，我参加了日期邮件测试xx@gmail.com我收到了这封电子邮件。怎么了？没人能帮我(