tp5 PHPMailer 端口465邮件发送成功了，为什么附带返回一段因为代码？导致本来能正常应用的邮件发送功能，ajax不能正确返回

镜像问题：tp5 phpmailer发送邮件代码：tp5 PHPMailer 端口465 端口25 邮件代码 阿里云服务器

解决办法：把调试模式关了。

$mail->SMTPDebug = 2;

改为$mail->SMTPDebug = 0;

SERVER -> CLIENT: 220 163.com Anti-spam GT for Coremail System (163com[20141201])
CLIENT -> SERVER: EHLO www.zan.com
SERVER -> CLIENT: 250-mail250-PIPELINING250-AUTH LOGIN PLAIN250-AUTH=LOGIN PLAIN250-coremail 1Uxr2xKj7kG0xkI17xGrU7I0s8FY2U3Uj8Cz28x1UUUUU7Ic2I0Y2UrMJ92xUCa0xDrUUUUj250-STARTTLS250 8BITMIME
CLIENT -> SERVER: AUTH LOGIN
SERVER -> CLIENT: 334 dXNlcm5hbWU6
CLIENT -> SERVER: WGlhbnRpYW4zQDE2My5jb20=
SERVER -> CLIENT: 334 UGFzc3dvcmQ6
CLIENT -> SERVER: Z3hjNDU2
SERVER -> CLIENT: 235 Authentication successful
CLIENT -> SERVER: MAIL FROM:<Xiantian3@163.com>
SERVER -> CLIENT: 250 Mail OK
CLIENT -> SERVER: RCPT TO:<613469912@qq.com>
SERVER -> CLIENT: 250 Mail OK
CLIENT -> SERVER: DATA
SERVER -> CLIENT: 354 End data with <CR><LF>.<CR><LF>
CLIENT -> SERVER: Date: Wed, 29 Nov 2017 04:59:06 +0800
CLIENT -> SERVER: To: 613469912@qq.com
CLIENT -> SERVER: From: Xiantian3@163.com
CLIENT -> SERVER: Subject: =?utf-8?B?5aqS5L2T6LWE5rqQ?=
CLIENT -> SERVER: Message-ID: <d6507530222ec1b636fe36219f853e6c@www.zan.com>
CLIENT -> SERVER: X-Mailer: PHPMailer 6.0.0 (https://github.com/PHPMailer/PHPMailer)
CLIENT -> SERVER: MIME-Version: 1.0
CLIENT -> SERVER: Content-Type: text/html; charset=utf-8
CLIENT -> SERVER: Content-Transfer-Encoding: 8bit
CLIENT -> SERVER:
CLIENT -> SERVER: 您的验证码是 7759 有效期60s
CLIENT -> SERVER:
CLIENT -> SERVER: .
SERVER -> CLIENT: 250 Mail OK queued as smtp12,EMCowADnHUsd0Rxa1n5RBg--.27258S2 1511837982
CLIENT -> SERVER: QUIT
SERVER -> CLIENT: 221 Bye