blocks|key|394839|text|有些SMTP服务器无需身份验证即可工作，但如果服务器需要身份验证，则无法规避这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|394840|PHP的内置邮件功能非常有限--只能在WIndows中指定SMTP服务器。在*nix上，mail()将使用操作系统的二进制文件。|offset|length|style|CODE|394841|如果要将电子邮件发送到网络上的任意SMTP服务器，请考虑使用像SwiftMailer这样的库。这将使您能够使用，例如，谷歌邮件的发送服务器。|394842|entityMap|0|LINK|mutability|MUTABLE|url|http://swiftmailer.org/^0|0|18|6|0|V|B|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

There are some SMTP servers that work without authentication, but if the server requires authentication, there is no way to circumvent that. 

PHP's built-in mail functions are very limited - specifying the SMTP server is possible in WIndows only. On *nix, <code>mail()</code> will use the OS's binaries.

If you want to send E-Mail to an arbitrary SMTP server on the net, consider using a library like <a href="http://swiftmailer.org/">SwiftMailer</a>. That will enable you to use, for example, Google Mail's outgoing servers.

blocks|key|177045|text|当您通过需要SMTP身份验证的服务器发送电子邮件时，您确实需要指定它，并设置主机、用户名和密码(如果不是默认端口，还可以设置端口-+25)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|177046|例如，我通常使用与以下设置类似的PHPMailer：|177047|$mail+=+new+PHPMailer();

//+Settings
$mail->IsSMTP();
$mail->CharSet+=+'UTF-8';

$mail->Host+++++++=+"mail.example.com";++++//+SMTP+server+example
$mail->SMTPDebug++=+0;+++++++++++++++++++++//+enables+SMTP+debug+information+(for+testing)
$mail->SMTPAuth+++=+true;++++++++++++++++++//+enable+SMTP+authentication
$mail->Port+++++++=+25;++++++++++++++++++++//+set+the+SMTP+port+for+the+GMAIL+server
$mail->Username+++=+"username";++++++++++++//+SMTP+account+username+example
$mail->Password+++=+"password";++++++++++++//+SMTP+account+password+example

//+Content
$mail->isHTML(true);+++++++++++++++++++++++//+Set+email+format+to+HTML
$mail->Subject+=+'Here+is+the+subject';
$mail->Body++++=+'This+is+the+HTML+message+body+in+bold!';
$mail->AltBody+=+'This+is+the+body+in+plain+text+for+non-HTML+mail+clients';

$mail->send();|code-block|syntax|javascript|177048|你可以在这里找到更多关于PHPMailer的信息：https://github.com/PHPMailer/PHPMailer|offset|length|177049|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/PHPMailer/PHPMailer^0|0|0|0|P|12|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

When you are sending an e-mail through a server that requires SMTP Auth, you really need to specify it, and set the host, username and password (and maybe the port if it is not the default one - 25).
For example, I usually use PHPMailer with similar settings to this ones:
<pre><code>$mail = new PHPMailer();

// Settings
$mail-&gt;IsSMTP();
$mail-&gt;CharSet = 'UTF-8';

$mail-&gt;Host = &quot;mail.example.com&quot;; // SMTP server example
$mail-&gt;SMTPDebug = 0; // enables SMTP debug information (for testing)
$mail-&gt;SMTPAuth = true; // enable SMTP authentication
$mail-&gt;Port = 25; // set the SMTP port for the GMAIL server
$mail-&gt;Username = &quot;username&quot;; // SMTP account username example
$mail-&gt;Password = &quot;password&quot;; // SMTP account password example

// Content
$mail-&gt;isHTML(true); // Set email format to HTML
$mail-&gt;Subject = 'Here is the subject';
$mail-&gt;Body = 'This is the HTML message body &lt;b&gt;in bold!&lt;/b&gt;';
$mail-&gt;AltBody = 'This is the body in plain text for non-HTML mail clients';

$mail-&gt;send();
</code></pre>
You can find more about PHPMailer here: <a href="https://github.com/PHPMailer/PHPMailer" rel="noreferrer">https://github.com/PHPMailer/PHPMailer</a>

blocks|key|177092|text|<?php
ini_set("SMTP",+"aspmx.l.google.com");
ini_set("sendmail_from",+"YOURMAIL@gmail.com");

$message+=+"The+mail+message+was+sent+with+the+following+mail+setting:\r\nSMTP+=+aspmx.l.google.com\r\nsmtp_port+=+25\r\nsendmail_from+=+YourMail@address.com";

$headers+=+"From:+YOURMAIL@gmail.com";

mail("Sending@provider.com",+"Testing",+$message,+$headers);
echo+"Check+your+email+now....&lt;BR/>";
?>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|177093|或者，有关更多详细信息，请参阅read+on。|unstyled|offset|length|177094|entityMap|0|LINK|mutability|MUTABLE|url|http://web.archive.org/web/20150810100020/http://kb.zend.com:80/smtp-mail-the-php-mail-function-for-iseries^0|0|F|7|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre class="lang-php prettyprint-override"><code>&lt;?php
ini_set("SMTP", "aspmx.l.google.com");
ini_set("sendmail_from", "YOURMAIL@gmail.com");

$message = "The mail message was sent with the following mail setting:\r\nSMTP = aspmx.l.google.com\r\nsmtp_port = 25\r\nsendmail_from = YourMail@address.com";

$headers = "From: YOURMAIL@gmail.com";

mail("Sending@provider.com", "Testing", $message, $headers);
echo "Check your email now....&amp;lt;BR/&gt;";
?&gt;
</code></pre>

or, for more details, <a href="http://web.archive.org/web/20150810100020/http://kb.zend.com:80/smtp-mail-the-php-mail-function-for-iseries" rel="noreferrer">read on</a>.

blocks|key|394986|text|对于Unix用户，邮件()实际上是使用Sendmail命令发送电子邮件。您可以更改环境，而不是修改应用程序。msmtp是与Sendmail兼容的命令行界面语法的SMTP客户端，这意味着它可以用来代替Sendmail。它只需要对您的php.ini进行很小的更改。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|394987|sendmail_path+=+"/usr/bin/msmtp+-C+/path/to/your/config+-t"|code-block|syntax|javascript|394988|然后，即使是低级的mail()函数也可以使用SMTP+work。如果你想在不修改应用程序的情况下将现有的应用程序连接到像sendgrid或mandrill这样的邮件服务上，它是非常有用的。|394989|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Sendmail|1|http://msmtp.sourceforge.net/^0|J|8|0|1I|5|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

For Unix users, mail() is actually using <a href="https://en.wikipedia.org/wiki/Sendmail" rel="noreferrer">Sendmail</a> command to send email. Instead of modifying the application, you can change the environment. <a href="http://msmtp.sourceforge.net" rel="noreferrer">msmtp</a> is an SMTP client with Sendmail compatible CLI syntax which means it can be used in place of Sendmail. It only requires a small change to your php.ini.

<pre><code>sendmail_path = "/usr/bin/msmtp -C /path/to/your/config -t"
</code></pre>

Then even the lowly mail() function can work with SMTP goodness. It is super useful if you're trying to connect an existing application to mail services like sendgrid or mandrill without modifying the application.

blocks|key|395019|text|如果您在Linux上托管了一个邮件站点并拥有服务器访问权限，那么可以通过安装msmtp来省去一些麻烦，它允许您通过标准的PHP+WordPress+()函数通过SMTP发送邮件。msmtp是postfix的一种更简单的替代方案，它需要更多的配置。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|395020|以下是步骤：|395021|安装msmtp|395022|sudo+apt-get+install+msmtp-mta+ca-certificates|code-block|syntax|javascript|395023|创建新的配置文件：|395024|sudo+nano+/etc/msmtprc|395025|...with以下配置信息：|395026|#+Set+defaults.
defaults

#+Enable+or+disable+TLS/SSL+encryption.
tls+on
tls_starttls+on
tls_trust_file+/etc/ssl/certs/ca-certificates.crt

#+Set+up+a+default+account's+settings.
account+default
host+<smtp.example.net>
port+587
auth+on
user+<username@example.net>
password+<password>
from+<address-to-receive-bounces@example.net>
syslog+LOG_MAIL|395027|您需要替换"<“和">”(包括删除它们)中的所有内容所表示的配置数据。对于host/username/password，使用您的普通凭据通过您的邮件提供商发送邮件。|395028|告诉PHP使用它|395029|sudo+nano+/etc/php5/apache2/php.ini|395030|添加这一行：|395031|sendmail_path+=+/usr/bin/msmtp+-t|395032|完整的文档可以在这里找到：|395033|https://marlam.de/msmtp/|395034|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/WordPress|1|https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol|2^0|1S|9|0|28|4|1|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|O|2|0^^$0|@$1|2|3|4|5|6|7|1J|8|@]|9|@$A|1K|B|1L|1|1M]|$A|1N|B|1O|1|1P]]|C|$]]|$1|D|3|E|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1R|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1S|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1T|8|@]|9|@]|C|$]]|$1|O|3|P|5|J|7|1U|8|@]|9|@]|C|$K|L]]|$1|Q|3|R|5|6|7|1V|8|@]|9|@]|C|$]]|$1|S|3|T|5|J|7|1W|8|@]|9|@]|C|$K|L]]|$1|U|3|V|5|6|7|1X|8|@]|9|@]|C|$]]|$1|W|3|X|5|6|7|1Y|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|J|7|1Z|8|@]|9|@]|C|$K|L]]|$1|10|3|11|5|6|7|20|8|@]|9|@]|C|$]]|$1|12|3|13|5|J|7|21|8|@]|9|@]|C|$K|L]]|$1|14|3|15|5|6|7|22|8|@]|9|@]|C|$]]|$1|16|3|17|5|6|7|23|8|@]|9|@$A|24|B|25|1|26]]|C|$]]|$1|18|3|-4|5|6|7|27|8|@]|9|@]|C|$]]]|19|$1A|$5|1B|1C|1D|C|$1E|1F]]|1G|$5|1B|1C|1D|C|$1E|1H]]|1I|$5|1B|1C|1D|C|$1E|17]]]]

In cases where you are hosting a <a href="https://en.wikipedia.org/wiki/WordPress" rel="nofollow noreferrer">WordPress</a> site on Linux and have server access, you can save some headaches by installing msmtp which allows you to send via <a href="https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" rel="nofollow noreferrer">SMTP</a> from the standard PHP mail() function. msmtp is a simpler alternative to postfix which requires a bit more configuration.
Here are the steps:
Install msmtp
<pre><code>sudo apt-get install msmtp-mta ca-certificates
</code></pre>
Create a new configuration file:
<pre><code>sudo nano /etc/msmtprc
</code></pre>
...with the following configuration information:
<pre><code># Set defaults.
defaults

# Enable or disable TLS/SSL encryption.
tls on
tls_starttls on
tls_trust_file /etc/ssl/certs/ca-certificates.crt

# Set up a default account's settings.
account default
host &lt;smtp.example.net&gt;
port 587
auth on
user &lt;username@example.net&gt;
password &lt;password&gt;
from &lt;address-to-receive-bounces@example.net&gt;
syslog LOG_MAIL
</code></pre>
You need to replace the configuration data represented by everything within &quot;&lt;&quot; and &quot;&gt;&quot; (inclusive, remove these). For host/username/password, use your normal credentials for sending mail through your mail provider.
Tell PHP to use it
<pre><code>sudo nano /etc/php5/apache2/php.ini
</code></pre>
Add this single line:
<pre><code>sendmail_path = /usr/bin/msmtp -t
</code></pre>
Complete documentation can be found here:
<a href="https://marlam.de/msmtp/" rel="nofollow noreferrer">https://marlam.de/msmtp/</a>

blocks|key|395046|text|对于另一种方法，您可以采用这样的文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|395047|From:+Sunday+<sunday@gmail.com>
To:+Monday+<monday@gmail.com>
Subject:+Day

Tuesday+Wednesday|code-block|syntax|javascript|395048|然后像这样发送：|395049|<?php
$a1+=+['monday@gmail.com'];
$r1+=+fopen('a.txt',+'r');
$r2+=+curl_init('smtps://smtp.gmail.com');
curl_setopt($r2,+CURLOPT_MAIL_RCPT,+$a1);
curl_setopt($r2,+CURLOPT_NETRC,+true);
curl_setopt($r2,+CURLOPT_READDATA,+$r1);
curl_setopt($r2,+CURLOPT_UPLOAD,+true);
curl_exec($r2);|395050|https://php.net/function.curl-setopt|offset|length|395051|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|10|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|X|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Z|8|@]|9|@$M|10|N|11|1|12]]|A|$]]|$1|O|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|L]]]]

For another approach, you can take a file like this:
<pre><code>From: Sunday &lt;sunday@gmail.com&gt;
To: Monday &lt;monday@gmail.com&gt;
Subject: Day

Tuesday Wednesday
</code></pre>
and send like this:
<pre><code>&lt;?php
$a1 = ['monday@gmail.com'];
$r1 = fopen('a.txt', 'r');
$r2 = curl_init('smtps://smtp.gmail.com');
curl_setopt($r2, CURLOPT_MAIL_RCPT, $a1);
curl_setopt($r2, CURLOPT_NETRC, true);
curl_setopt($r2, CURLOPT_READDATA, $r1);
curl_setopt($r2, CURLOPT_UPLOAD, true);
curl_exec($r2);
</code></pre>
<a href="https://php.net/function.curl-setopt" rel="nofollow noreferrer">https://php.net/function.curl-setopt</a>

blocks|key|177212|text|我为PHP创建了一个简单的轻量级SMTP电子邮件发送器，如果有人需要它的话。以下是URL：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|177213|https://github.com/jerryurenaa/EZMAIL|offset|length|177214|它在生产和开发两个环境中都进行了测试。|177215|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|11|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

I created a simple lightweight SMTP email sender for PHP if anybody needs it. Here is the URL:
<a href="https://github.com/jerryurenaa/EZMAIL" rel="nofollow noreferrer">https://github.com/jerryurenaa/EZMAIL</a>
It was tested in both environments, production and development.

blocks|key|395109|text|我知道这是一个老问题，但它仍然有效，我看到的所有答案都显示了基本身份验证，但已被弃用。下面是一个示例，展示了如何使用带XOAUTH2身份验证的PHPMailer通过谷歌的Gmail服务器发送邮件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|395110|//Import+PHPMailer+classes+into+the+global+namespace
use+PHPMailer\PHPMailer\PHPMailer;
use+PHPMailer\PHPMailer\SMTP;
use+PHPMailer\PHPMailer\OAuth;
//Alias+the+League+Google+OAuth2+provider+class
use+League\OAuth2\Client\Provider\Google;

//SMTP+needs+accurate+times,+and+the+PHP+time+zone+MUST+be+set
//This+should+be+done+in+your+php.ini,+but+this+is+how+to+do+it+if+you+don't+have+access+to+that
date_default_timezone_set('Etc/UTC');

//Load+dependencies+from+composer
//If+this+causes+an+error,+run+'composer+install'
require+'../vendor/autoload.php';

//Create+a+new+PHPMailer+instance
$mail+=+new+PHPMailer();

//Tell+PHPMailer+to+use+SMTP
$mail->isSMTP();

//Enable+SMTP+debugging
//SMTP::DEBUG_OFF+=+off+(for+production+use)
//SMTP::DEBUG_CLIENT+=+client+messages
//SMTP::DEBUG_SERVER+=+client+and+server+messages
$mail->SMTPDebug+=+SMTP::DEBUG_SERVER;

//Set+the+hostname+of+the+mail+server
$mail->Host+=+'smtp.gmail.com';

//Set+the+SMTP+port+number:
//+-+465+for+SMTP+with+implicit+TLS,+a.k.a.+RFC8314+SMTPS+or
//+-+587+for+SMTP%2BSTARTTLS
$mail->Port+=+465;

//Set+the+encryption+mechanism+to+use:
//+-+SMTPS+(implicit+TLS+on+port+465)+or
//+-+STARTTLS+(explicit+TLS+on+port+587)
$mail->SMTPSecure+=+PHPMailer::ENCRYPTION_SMTPS;

//Whether+to+use+SMTP+authentication
$mail->SMTPAuth+=+true;

//Set+AuthType+to+use+XOAUTH2
$mail->AuthType+=+'XOAUTH2';

//Fill+in+authentication+details+here
//Either+the+gmail+account+owner,+or+the+user+that+gave+consent
$email+=+'someone@gmail.com';
$clientId+=+'RANDOMCHARS-----duv1n2.apps.googleusercontent.com';
$clientSecret+=+'RANDOMCHARS-----lGyjPcRtvP';

//Obtained+by+configuring+and+running+get_oauth_token.php
//after+setting+up+an+app+in+Google+Developer+Console.
$refreshToken+=+'RANDOMCHARS-----DWxgOvPT003r-yFUV49TQYag7_Aod7y0';

//Create+a+new+OAuth2+provider+instance
$provider+=+new+Google(
++++[
++++++++'clientId'+=>+$clientId,
++++++++'clientSecret'+=>+$clientSecret,
++++]
);

//Pass+the+OAuth+provider+instance+to+PHPMailer
$mail->setOAuth(
++++new+OAuth(
++++++++[
++++++++++++'provider'+=>+$provider,
++++++++++++'clientId'+=>+$clientId,
++++++++++++'clientSecret'+=>+$clientSecret,
++++++++++++'refreshToken'+=>+$refreshToken,
++++++++++++'userName'+=>+$email,
++++++++]
++++)
);

//Set+who+the+message+is+to+be+sent+from
//For+gmail,+this+generally+needs+to+be+the+same+as+the+user+you+logged+in+as
$mail->setFrom($email,+'First+Last');

//Set+who+the+message+is+to+be+sent+to
$mail->addAddress('someone@gmail.com',+'John+Doe');

//Set+the+subject+line
$mail->Subject+=+'PHPMailer+GMail+XOAUTH2+SMTP+test';

//Read+an+HTML+message+body+from+an+external+file,+convert+referenced+images+to+embedded,
//convert+HTML+into+a+basic+plain-text+alternative+body
$mail->CharSet+=+PHPMailer::CHARSET_UTF8;
$mail->msgHTML(file_get_contents('contentsutf8.html'),+__DIR__);

//Replace+the+plain+text+body+with+one+created+manually
$mail->AltBody+=+'This+is+a+plain-text+message+body';

//Attach+an+image+file
$mail->addAttachment('images/phpmailer_mini.png');

//send+the+message,+check+for+errors
if+(!$mail->send())+{
++++echo+'Mailer+Error:+'+.+$mail->ErrorInfo;
}+else+{
++++echo+'Message+sent!';
}|code-block|syntax|javascript|395111|参考：PHPMailer+examples+folder|offset|length|395112|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/PHPMailer/PHPMailer/blob/master/examples/gmail_xoauth.phps^0|0|0|3|P|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I know this is an old question but it's still active and all the answers I saw showed basic authentication, which is deprecated. Here is an example showing how to send via Google's Gmail servers using PHPMailer with XOAUTH2 authentication:
<pre><code>//Import PHPMailer classes into the global namespace
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\OAuth;
//Alias the League Google OAuth2 provider class
use League\OAuth2\Client\Provider\Google;

//SMTP needs accurate times, and the PHP time zone MUST be set
//This should be done in your php.ini, but this is how to do it if you don't have access to that
date_default_timezone_set('Etc/UTC');

//Load dependencies from composer
//If this causes an error, run 'composer install'
require '../vendor/autoload.php';

//Create a new PHPMailer instance
$mail = new PHPMailer();

//Tell PHPMailer to use SMTP
$mail-&gt;isSMTP();

//Enable SMTP debugging
//SMTP::DEBUG_OFF = off (for production use)
//SMTP::DEBUG_CLIENT = client messages
//SMTP::DEBUG_SERVER = client and server messages
$mail-&gt;SMTPDebug = SMTP::DEBUG_SERVER;

//Set the hostname of the mail server
$mail-&gt;Host = 'smtp.gmail.com';

//Set the SMTP port number:
// - 465 for SMTP with implicit TLS, a.k.a. RFC8314 SMTPS or
// - 587 for SMTP+STARTTLS
$mail-&gt;Port = 465;

//Set the encryption mechanism to use:
// - SMTPS (implicit TLS on port 465) or
// - STARTTLS (explicit TLS on port 587)
$mail-&gt;SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;

//Whether to use SMTP authentication
$mail-&gt;SMTPAuth = true;

//Set AuthType to use XOAUTH2
$mail-&gt;AuthType = 'XOAUTH2';

//Fill in authentication details here
//Either the gmail account owner, or the user that gave consent
$email = 'someone@gmail.com';
$clientId = 'RANDOMCHARS-----duv1n2.apps.googleusercontent.com';
$clientSecret = 'RANDOMCHARS-----lGyjPcRtvP';

//Obtained by configuring and running get_oauth_token.php
//after setting up an app in Google Developer Console.
$refreshToken = 'RANDOMCHARS-----DWxgOvPT003r-yFUV49TQYag7_Aod7y0';

//Create a new OAuth2 provider instance
$provider = new Google(
 [
 'clientId' =&gt; $clientId,
 'clientSecret' =&gt; $clientSecret,
 ]
);

//Pass the OAuth provider instance to PHPMailer
$mail-&gt;setOAuth(
 new OAuth(
 [
 'provider' =&gt; $provider,
 'clientId' =&gt; $clientId,
 'clientSecret' =&gt; $clientSecret,
 'refreshToken' =&gt; $refreshToken,
 'userName' =&gt; $email,
 ]
 )
);

//Set who the message is to be sent from
//For gmail, this generally needs to be the same as the user you logged in as
$mail-&gt;setFrom($email, 'First Last');

//Set who the message is to be sent to
$mail-&gt;addAddress('someone@gmail.com', 'John Doe');

//Set the subject line
$mail-&gt;Subject = 'PHPMailer GMail XOAUTH2 SMTP test';

//Read an HTML message body from an external file, convert referenced images to embedded,
//convert HTML into a basic plain-text alternative body
$mail-&gt;CharSet = PHPMailer::CHARSET_UTF8;
$mail-&gt;msgHTML(file_get_contents('contentsutf8.html'), __DIR__);

//Replace the plain text body with one created manually
$mail-&gt;AltBody = 'This is a plain-text message body';

//Attach an image file
$mail-&gt;addAttachment('images/phpmailer_mini.png');

//send the message, check for errors
if (!$mail-&gt;send()) {
 echo 'Mailer Error: ' . $mail-&gt;ErrorInfo;
} else {
 echo 'Message sent!';
}
</code></pre>
Reference: <a href="https://github.com/PHPMailer/PHPMailer/blob/master/examples/gmail_xoauth.phps" rel="nofollow noreferrer">PHPMailer examples folder</a>

<pre><code>$from = "someonelse@example.com";
$headers = "From:" . $from;
echo mail ("borutflis1@gmail.com" ,"testmailfunction" , "Oj",$headers);
</code></pre>

I have trouble sending email in PHP. I get an error: <code>SMTP server response: 530 SMTP authentication is required</code>.

I was under the impression that you can send email without SMTP to verify. I know that this mail will propably get filtered out, but that doesn't matter right now.

<pre><code>[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 = someonelse@example.com
</code></pre>

This is the setup in the <code>php.ini</code> file. How should I set up SMTP? Are there any SMTP servers that require no verification or must I setup a server myself?

Sending email with PHP from an SMTP server

身份验证

服务器

Linux

OAuth

Unix

$from = "someonelse@example.com";$headers = "From:" . $from;echo mail ("borutflis1@gmail.com" ,"testmailfunction" , "Oj",$headers);我在用PHP发送电子邮件时遇到了问题。我得到一个错误：SM...

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