前几天研究多说插件的评论回复邮件通知(修改多说插件，实现评论邮件通知自定义样式)的时候，发现本博客用的主机封了 fsockopen 和 pfsockopen 两个函数，导致邮件无法正常发送，同时也不能连接 smtp 服务器发送邮件，只有 curl 可用。于是，想起了以前转过的一篇文章，免费超大量邮件发送服务Mailgun提供SMTP和API支持。将其替换了 wordpress 自带的邮件模块，发现效果还不错。虽然 QQ 邮箱有时候会拒收 = =|||
首先，我用了最省力的方法，安装插件
但是，没那么简单(如果这么简单我写这文章干嘛 = =)插件装完以后依旧无法正常发信。猜想其可能使用了 fsockopen 连接 mailgun 的邮件服务器，于是我修改了其发信模块，使用了 curl 连接 mailgun 服务器。
第二步，也是最后一步，将 ./plugins/mailgun/includes/wp-mail.php 的内容替换为以下代码1
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/**
* wp_mail function to be loaded in to override the core wp_mail function
* from wp-includes/pluggable.php
*
* Based off of the core wp_mail function, but with modifications required to
* send email using the Mailgun HTTP API
*
* @param string|array $to Array or comma-separated list of email addresses to send message.
* @param string $subject Email subject
* @param string $message Message contents
* @param string|array $headers Optional. Additional headers.
* @param string|array $attachments Optional. Files to attach.
* @return bool Whether the email contents were sent successfully.
* @since 0.1
*/
function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) {
// Compact the input, apply the filters, and extract them back out
extract( apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ) );
$mailgun = get_option( 'mailgun' );
$apiKey = ( defined( 'MAILGUN_APIKEY' ) && MAILGUN_APIKEY ) ? MAILGUN_APIKEY : $mailgun['apiKey'];
$domain = ( defined( 'MAILGUN_DOMAIN' ) && MAILGUN_DOMAIN ) ? MAILGUN_DOMAIN : $mailgun['domain'];
if ( empty( $apiKey ) || empty( $domain ) )
return false;
if ( !is_array($attachments) )
$attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) );
// Headers
if ( empty( $headers ) ) {
$headers = array();
} else {
if ( !is_array( $headers ) ) {
// Explode the headers out, so this function can take both
// string headers and an array of headers.
$tempheaders = explode( "\n", str_replace( "\r\n", "\n", $headers ) );
} else {
$tempheaders = $headers;
}
$headers = array();
$cc = array();
$bcc = array();
// If it's actually got contents
if ( !empty( $tempheaders ) ) {
// Iterate through the raw headers
foreach ( (array) $tempheaders as $header ) {
if ( strpos($header, ':') === false ) {
if ( false !== stripos( $header, 'boundary=' ) ) {
$parts = preg_split('/boundary=/i', trim( $header ) );
$boundary = trim( str_replace( array( "'", '"' ), '', $parts[1] ) );
}
continue;
}
// Explode them out
list( $name, $content ) = explode( ':', trim( $header ), 2 );
// Cleanup crew
$name = trim( $name );
$content = trim( $content );
switch ( strtolower( $name ) ) {
// Mainly for legacy -- process a From: header if it's there
case 'from':
if ( strpos($content, '<' ) !== false ) {
// So... making my life hard again?
$from_name = substr( $content, 0, strpos( $content, '<' ) - 1 );
$from_name = str_replace( '"', '', $from_name );
$from_name = trim( $from_name );
$from_email = substr( $content, strpos( $content, '<' ) + 1 );
$from_email = str_replace( '>', '', $from_email );
$from_email = trim( $from_email );
} else {
$from_email = trim( $content );
}
break;
case 'content-type':
if ( strpos( $content, ';' ) !== false ) {
list( $type, $charset ) = explode( ';', $content );
$content_type = trim( $type );
if ( false !== stripos( $charset, 'charset=' ) ) {
$charset = trim( str_replace( array( 'charset=', '"' ), '', $charset ) );
} elseif ( false !== stripos( $charset, 'boundary=' ) ) {
$boundary = trim( str_replace( array( 'BOUNDARY=', 'boundary=', '"' ), '', $charset ) );
$charset = '';
}
} else {
$content_type = trim( $content );
}
break;
case 'cc':
$cc = array_merge( (array) $cc, explode( ',', $content ) );
break;
case 'bcc':
$bcc = array_merge( (array) $bcc, explode( ',', $content ) );
break;
default:
// Add it to our grand headers array
$headers[trim( $name )] = trim( $content );
break;
}
}
}
}
// From email and name
// If we don't have a name from the input headers
if ( !isset( $from_name ) )
$from_name = 'PostMaster';
/* If we don't have an email from the input headers default to wordpress@$sitename
* Some hosts will block outgoing mail from this address if it doesn't exist but
* there's no easy alternative. Defaulting to admin_email might appear to be another
* option but some hosts may refuse to relay mail from an unknown domain. See
* http://trac.wordpress.org/ticket/5007.
*/
if ( !isset( $from_email ) ) {
// Get the site domain and get rid of www.
$sitename = strtolower( $_SERVER['SERVER_NAME'] );
if ( substr( $sitename, 0, 4 ) == 'www.' ) {
$sitename = substr( $sitename, 4 );
}
$from_email = 'postmaster@' . $sitename;
}
// Plugin authors can override the potentially troublesome default
$from_email = apply_filters( 'wp_mail_from' , $from_email );
$from_name = apply_filters( 'wp_mail_from_name', $from_name );
$body = array(
'from' => "{$from_name} <{$from_email}>",
'to' => $to,
'subject' => $subject,
'text' => $message
);
$body['o:tracking-clicks'] = isset( $mailgun['track-clicks'] ) ? $mailgun['track-clicks'] : "no";
$body['o:tracking-opens'] = isset( $mailgun['track-opens'] ) ? "yes" : "no";
if ( isset( $mailgun['tag'] ) ){
$tags = explode(",", str_replace(" ","", $mailgun['tag']));
$body['o:tag'] = $tags;
}
if ( isset( $mailgun['campaign-id'] ) ){
$campaigns = explode(",", str_replace(" ","", $mailgun['campaign-id']));
$body['o:campaign'] = $campaigns;
}
if ( ! empty( $cc ) && is_array( $cc ) )
$body['cc'] = implode( ', ', $cc );
if ( ! empty( $bcc ) && is_array( $bcc ) )
$body['bcc'] = implode( ', ', $bcc );
// Set Content-Type and charset
// If we don't have a content-type from the input headers
if ( !isset( $content_type ) )
$content_type = 'text/plain';
$content_type = apply_filters( 'wp_mail_content_type', $content_type );
if ( $content_type == 'text/html' ) {
$body['html'] = $message;
$body['text'] = strip_tags( $message );
}
// If we don't have a charset from the input headers
if ( !isset( $charset ) )
$charset = get_bloginfo( 'charset' );
// Set the content-type and charset
$charset = apply_filters( 'wp_mail_charset', $charset );
if ( isset( $headers['Content-Type'] ) ) {
if ( ! strstr( $headers['Content-Type'], 'charset' ) )
$headers['Content-Type'] = rtrim( $headers['Content-Type'], '; ' ) . "; charset={$charset}";
}
// Set custom headers
if ( !empty( $headers ) ) {
foreach( (array) $headers as $name => $content ) {
$body["h:{$name}"] = $content;
}
// TODO: Can we handle this?
//if ( false !== stripos( $content_type, 'multipart' ) && ! empty($boundary) )
// $phpmailer->AddCustomHeader( sprintf( "Content-Type: %s;\n\t boundary=\"%s\"", $content_type, $boundary ) );
}
/*
* Deconstruct post array and create POST payload.
* This entire routine is because wp_remote_post does
* not support files directly.
*/
// First, generate a boundary for the multipart message.
$boundary = base_convert(uniqid('boundary', true), 10, 36);
$payload = null;
// Iterate through pre-built params and build payload:
foreach ( $body as $key => $value ) {
if ( is_array( $value ) ){
$parent_key = $key;
foreach($value as $key => $value){
$payload .= '--' . $boundary;
$payload .= "\r\n";
$payload .= 'Content-Disposition: form-data; name="' . $parent_key . '[' . $key . ']"' . "\r\n\r\n";
$payload .= $value;
$payload .= "\r\n";
}
}
else{
$payload .= '--' . $boundary;
$payload .= "\r\n";
$payload .= 'Content-Disposition: form-data; name="' . $key . '"' . "\r\n\r\n";
$payload .= $value;
$payload .= "\r\n";
}
}
// If we have attachments, add them to the payload.
if ( !empty( $attachments ) ){
$i = 0;
foreach ( $attachments as $attachment ) {
if ( !empty( $attachment ) ) {
/*$payload .= '--' . $boundary;
$payload .= "\r\n";
$payload .= 'Content-Disposition: form-data; name="attachment[' . $i . ']"; filename="' . basename( $attachment ) . '"' . "\r\n\r\n";
$payload .= file_get_contents( $attachment );
$payload .= "\r\n";*/
$attachments[$i]="@".$attachment;
$i++;
}
}
}
$payload .= '--' . $boundary . '--';
$data = array(
'body' => $payload,
'headers' => array(
'content-type' => 'multipart/form-data; boundary=' . $boundary)
);
$url = "https://api.mailgun.net/v2/{$domain}/messages";
/*
// TODO: Mailgun only supports 1000 recipients per request, since we are
// overriding this function, let's add looping here to handle that
$response = wp_remote_post( $url, $data );
if ( is_wp_error( $response ) )
return false;
$response_code = wp_remote_retrieve_response_code( $response );
if ( (int) $response_code != 200 )
return false;
// Not sure there is any additional checking that needs to be done here, but why not?
$response_body = json_decode( wp_remote_retrieve_body( $response ) );
if ( ! isset( $response_body->message ) || $response_body->message != 'Queued. Thank you.' )
return false;
return true;*/
foreach ($attachments as $k=>$attachment) {
$body["attachment[".$k."]"]=$attachment;
}
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_USERPWD, 'api:'.$apiKey);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$body);
$result=curl_exec($ch);
curl_close($ch);
$result=json_decode($result,1);
return $result["message"]=="Queued. Thank you.";
}
实测可以解决无法发信的问题，但是并没有测试过带附件发送，不知附件那部分有没有问题，希望有大神能帮忙看下。。。谢谢