我的mail（）php函数发送电子邮件，但其可交付性非常低。
我的服务器是DEBIAN，我没有安装服务器。
退回地址不符合以下域名： https://www.mail-tester.com/web-OPQmPm
您可能希望发布域名的DNS记录（MX类型） fox-main.bay30.ovh或使用不同的退回电子邮件地址。
我的php.ini配置是：
[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 = me@example.com
; For Unix only. You may supply arguments as well (default: "sendmail -t -i").
; http://php.net/sendmail-path
;sendmail_path =
; Force the addition of the specified parameters to be passed as extra parameters
; to the sendmail binary. These parameters will always replace the value of
; the 5th parameter to mail(), even in safe mode.
;mail.force_extra_parameters =
; Add X-PHP-Originating-Script: that will include uid of the script followed by the filename
mail.add_x_header = On
; The path to a log file that will log all mail() calls. Log entries include
; the full path of the script, line number, To address and headers.
;mail.log =
我的问题是：在我的情况下post（）php函数是什么（postfix？qmail？...）以及如何解决这个问题？
收到的电子邮件是：
Received: by mail-tester.com (Postfix, from userid 500) id AF3D7A017A;
Sun, 23 Oct 2016 14:52:39 +0200 (CEST)
X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on mail-tester.com
X-Spam-Level: **
X-Spam-Status: No/2.2/5.0
X-Spam-Test-Scores: HEADER_FROM_DIFFERENT_DOMAINS=0.001,
HTML_IMAGE_ONLY_16=1.048,HTML_IMAGE_RATIO_06=0.001,HTML_MESSAGE=0.001,
MIME_HTML_ONLY=1.105,SPF_HELO_PASS=-0.001,SPF_PASS=-0.001,
T_RP_MATCHES_RCVD=-0.01,T_TVD_MIME_EPI=0.01
X-Spam-Last-External-IP: 91.121.157.162
X-Spam-Last-External-HELO: fox-main.bay30.ovh
X-Spam-Last-External-rDNS: fox-main.bay30.ovh
X-Spam-Date-of-Scan: Sun, 23 Oct 2016 14:52:39 +0200
X-Spam-Report: * -0.0 SPF_HELO_PASS SPF: HELO matches SPF record * -0.0
T_RP_MATCHES_RCVD Envelope sender domain matches handover relay *
domain * 0.0 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level
mail * domains are different * -0.0 SPF_PASS SPF: sender matches SPF
record * 0.0 HTML_IMAGE_RATIO_06 BODY: HTML has a low ratio of text to
image area * 1.0 HTML_IMAGE_ONLY_16 BODY: HTML: images with 1200-1600
bytes of words * 0.0 HTML_MESSAGE BODY: HTML included in message * 0.0
T_TVD_MIME_EPI BODY: No description available. * 1.1 MIME_HTML_ONLY BODY:
Message only has text/html MIME parts
Received-SPF: Pass (sender SPF authorized) identity=mailfrom;
client-ip=91.121.157.162; helo=fox-main.bay30.ovh;
envelope-from=root@fox-main.bay30.ovh; receiver=web-opqmpm@mail-tester.com
DMARC-Filter: OpenDMARC Filter v1.3.1 mail-tester.com 46E079FF4E
Authentication-Results: mail-tester.com; dmarc=none
header.from=fox-poker.com
Received: from fox-main.bay30.ovh (fox-main.bay30.ovh [91.121.157.162]) (using TLSv1.2
with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested)
by mail-tester.com (Postfix) with ESMTPS id 46E079FF4E
for <web-OPQmPm@mail-tester.com>; Sun, 23 Oct 2016 14:52:38 +0200 (CEST)
Received: from fox-main.bay30.ovh (localhost.localdomain [127.0.0.1])
by fox-main.bay30.ovh (8.14.4/8.14.4/Debian-4) with ESMTP id u9NCqceQ021366
for <web-OPQmPm@mail-tester.com>; Sun, 23 Oct 2016 14:52:38 +0200
Received: (from root@localhost) by fox-main.bay30.ovh (8.14.4/8.14.4/Submit)
id u9NCqcrX021365; Sun, 23 Oct 2016 14:52:38 +0200
Message-Id: <201610231252.u9NCqcrX021365@fox-main.bay30.ovh>
To: web-OPQmPm@mail-tester.com
Subject: Votre compte Fox-Poker, testEMail.php
X-PHP-Originating-Script: 1000:email.php
Date: Sun, 23 Oct 2016 14:52:38 +0200
MIME-version: 1.0
From: contact@fox-poker.com
Return-Path: root@fox-main.bay30.ovh
Content-Type: multipart/mixed; boundary=_24cc77109e4a921619d8d5058adc7bd8_
Content-Transfer-Encoding: BASE64
fox-main.bay30.ovh从哪里来？ （我的电子邮件脚本中没有此类信息！）