No Money No Honey

20220310-若有用MAILSCANNER加入簽名功能，改到表身BODY資料，DKIM驗證會失敗，取消即可。
https://www.catidc.com/news/content/3.htmlCentOS 5.x系列 官方停止更新支持后yum源失效解决方案发布时间：2021-04-22 22:02:55近期CentOS 5.x系列官方已经停止更新支持，同时官方也把yum源删除了，目前CentOS 5.x系统使用yum命令安装软件包基本都是失败,报错404 NotFound，因此需要更换yum源。执行以下代码后即可恢复正常使用cat  >  /etc/yum.repos.d/CentOS-Base.repo  <<EOF
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.aliyun.com/centos-vault/5.11/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5#released updates [updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.aliyun.com/centos-vault/5.11/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5#packages used/produced in the build but not released[addons]
name=CentOS-$releasever - Addons
baseurl=http://mirrors.aliyun.com/centos-vault/5.11/addons/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5#additional packages that may be useful[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirrors.aliyun.com/centos-vault/5.11/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5#additional packages that extend functionality of existing packages[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirrors.aliyun.com/centos-vault/5.11/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5#contrib - packages by Centos Users[contrib]
name=CentOS-$releasever - Contrib
baseurl=http://mirrors.aliyun.com/centos-vault/5.11/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
EOF================

出處：https://blog.xuite.net/magic20095/wretch/111940549< POP3及IMAP 部分 >
編輯
[root@mail ~]# vi /etc/pki/dovecot/dovecot-openssl.cnf
[ req ]
default_bits = 2048   金鑰長度預設為1024 bits
encrypt_key = yes
distinguished_name = req_dn
x509_extensions = cert_type
prompt = no

FOXMAIL最少只能設定14天，我希望能保存八天即可
加入排程
[root@mail maildir]# vim /etc/crontab設定時間與指令#每日0點10分刪除使用者信箱保留8天10 0 * * * root find /var/spool/maildir/*/cur -mdate +8 -exec rm {} \;==================
每個USER信箱可用萬用字元代替，就可以不用迴圈處理 /var/spool/maildir/*

錯誤資訊：Please check the email <'sandy.ou@XXX.com'>, server reply: 501 5.1.3 Bad recipient address syntax=============這是按下全部回覆後信寄不出去出現錯誤訊息，看出什麼端倪沒?是的，主要寄信人建立通訊路時多了 ' 這個(應該是COPY地址時造成)，USER反問我為何對方使用這個有 ' 的帳號寄給他他卻能收到，這個問題還是得去對方的SERVER上找答案，但就正常的SERVER來看 'sandy.ou@XXX.com' 跟 sandy.ou@XXX.com 絕對是不一樣的東西，且我確定SERVER只看的懂後面沒有 ' ' 號的郵件地址。

最近被這個垃圾信困擾了很久(mail.killalzheimer.bid, *.bid)，設定了許多限制還是無法阻檔，今天多加了紅色的規則後，少數惱人的垃圾郵件終於被擋了，對於有些正規公司因沒設定好HELO設定(該公司IT該被打屁股)，也被擋的話，再加入白名單即可。
========================================
main.cf 設定： ###############################################
# ★ 要求 MUA 發出 HELO 信號 #
###############################################
# 說明：
# 預設值：no
# 正常的 MUA 軟體在寄信時會發出 HELO 信號表明主機網域身份，
# 有些垃圾郵件軟體會忽略這個步驟，這可阻擋一部分垃圾郵件。

參考網址 http://blogger.liaohaha.tw/2015/07/postfix-smtp.html check_sender_mx_access cidr:/etc/postfix/check_bad_mx  #使用設定的主機檢查表/etc/postfix/check_bad_mx ，判斷MAIL FROM後接的寄件者位址，其MX主機是否在禁用黑名單內，若是則拒絕連線 對照表/etc/postfix/check_bad_mx內容大致如下： 192.168.2.0/24     550 Bad mx check_bad_mx使用cidr格式，設定好可以直接使用。 ========= 正式設定  

垃圾信標頭： Return-Path: <webmd@healthylifestyle1.website>
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
    mail.t3ex-techiview.com
X-Spam-Level: ***
X-Spam-Status: No, score=3.4 required=5.0 tests=BAYES_00,HTML_MESSAGE,
    RDNS_NONE,T_REMOTE_IMAGE,URIBL_BLOCKED,URIBL_DBL_SPAM,XPRIO autolearn=no
    version=3.3.1
Delivered-To: roger.lin@XXX.com
Received: from eo09t.healthylifestyle1.website (unknown [185.153.228.53])
    by mail.t3ex-techiview.com (Postfix) with ESMTP id BB00D7A01DE
    for <it@XXX.com>; Wed, 20 Jul 2016 20:43:18 +0800 (CST)
Received: from 0102d464.eo09t.healthylifestyle1.website ([127.0.0.1]:10236 helo=eo09t.healthylifestyle1.website)
    by eo09t.healthylifestyle1.website with ESMTP id 01BBAMRQXJT02D4QHCHVLKST64;
    for <it@XXX.com>; Wed, 20 Jul 2016 08:43:15 -0400
To: <it@XXX.com>
Date: Wed, 20 Jul 2016 08:43:15 -0400
Message-ID: <12363301696142412365811837531033@eo09t.healthylifestyle1.website>
From: "WebMD" <WebMD@healthylifestyle1.website>
Subject: Lose 1lb of belly fat every day!
X-Priority: 3 (Normal) 16961424
Importance: Normal
Content-Language: en-us
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: multipart/alternative;
    boundary="----=Part.600.8474.1469018595"
X-Hiview-MailScanner-Information: Please contact the ISP for more information
X-Hiview-MailScanner-ID: BB00D7A01DE.AC03B
X-Hiview-MailScanner: Found to be clean
X-Hiview-MailScanner-From: webmd@healthylifestyle1.website