[WP插件] Easy WP SMTP 補丁，解決 「ERROR 550：Bad HELO」問題

Wordpress 在VPS /Hosting 中常常預到server沒有PHPMAL，所以就要使用SMTP來send信。

簡單隨便安裝一個插件即可，但如果預上網站和電郵服務在兩台不同的server上，你可以設定了SMTP都會出錯

PHPMailer 550 Bad HELO 錯誤

下面我以這個插件Easy WP SMTP 做例子，其實主要也是修改PHPMailer的代碼

以下修改針對版本為Easy WP SMTP 2.1.0 easy-wp-smtp/src/Processor.php 改1處 找到以下

$phpmailer->Host = $connection_options->get( $mailer, 'host' );
$phpmailer->Port = $connection_options->get( $mailer, 'port' ); 

加入一行，變成如下

$phpmailer->Host = $connection_options->get( $mailer, 'host' );
$phpmailer->Port = $connection_options->get( $mailer, 'port' );
$phpmailer->Hostname = $connection_options->get( $mailer, 'host' );

easy-wp-smtp/inc/deprecated/class-easywpsmtp.php 改2處

找到以下

$phpmailer->Host = $this->opts['smtp_settings']['host'];
$phpmailer->Port = $this->opts['smtp_settings']['port'];

加入一行，變成如下

$phpmailer->Host = $this->opts['smtp_settings']['host'];
$phpmailer->Port = $this->opts['smtp_settings']['port'];
$phpmailer->Hostname = $this->opts['smtp_settings']['host'];

找到以下

$mail->Host = $this->opts['smtp_settings']['host'];
$mail->Port = $this->opts['smtp_settings']['port'];

加入一行，變成如下

$mail->Host = $this->opts['smtp_settings']['host'];
$mail->Port = $this->opts['smtp_settings']['port'];
$mail->Hostname = $this->opts['smtp_settings']['host'];

修改後請記得不要更新此插件