當我運行以下 PHP 代碼時，出現錯誤。$mail = new PHPMailer;$mail->isSMTP();$mail->SMTPDebug = SMTP::DEBUG_SERVER; // debug$mail->Host = 'localhost';$mail->Port = 25;$mail->SMTPAuth = true;$mail->Username = $uname;$mail->Password = $pw;$mail->CharSet = PHPMailer::CHARSET_UTF8;$mail->setFrom('[email protected]', 'website registration');$mail->addAddress($cleaned_email);$mail->Subject = 'Please verify your account';$msg = '[registration text...]'$msg = wordwrap($msg, 70);$mail->Body = $msg;                        if (!$mail->send()) {  echo $mail->ErrorInfo;  exit();} else {  [... add user to db, etc...]}郵件似乎已發送。PHPMailer 不會生成任何錯誤，并且數據庫代碼會運行。這是在 mail.log 中生成的錯誤。Aug 22 11:47:06 server postfix/smtp[8339]: 079AB1F909: to=<outsider-at-anydomain.com>, relay=mail.brighthouse.com[47.43.26.56]:25, delay=5.7, delays=0.06/0.02/0.31/5.3, dsn=2.0.0, status=sent (250 2.0.0 <user-at-example.com> sender rejected. Please see understanding-email-error-codes for more information.)我嘗試將發送地址更改為我在 PHP 代碼中進行身份驗證的用戶。我嘗試將帶有匹配哈希表的 smtpd_sender_login_maps 參數添加到我的后綴配置中，以將無回復地址映射到我進行身份驗證的用戶，但它會將其作為未使用的參數忽略。后綴配置：# See /usr/share/postfix/main.cf.dist for a commented, more complete version# Debian specific:  Specifying a file name will cause the first# line of that file to be used as the name.  The Debian default# is /etc/mailname.#myorigin = /etc/mailnamesmtpd_banner = $myhostname ESMTP $mail_name (Raspbian)biff = no# appending .domain is the MUA's job.append_dot_mydomain = no# Uncomment the next line to generate "delayed mail" warnings#delay_warning_time = 4hreadme_directory = no# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on# fresh installs.compatibility_level = 2