The frustration of getting falsely flagged as a spammer is not strange to most of the mail server admins. By excluding the possibility of a compromised server, a false flag is usually caused by one of the following: the server is an open mail relay the sender's or server's IP address is blacklisted the server does not have a Fully Qualified Domain Name (FQDN) and a PTR record the Sender Policy Framework (SPF) DNS record is missing or it is misconfigured the DomainKeys Identified Mail (DKIM) implementation is missing or it's not properly set up ......

function mycommand($command,$pwd=''){       $descriptorspec = array(             0 => array("pipe", "r"),  // 标准输入，子进程从此管道中读取数据             1 => array("pipe", "w"),  // 标准输出，子进程向此管道中写入数据             2 => array("file", "/tmp/error-output.txt", "a") // 标准错误，写入到一个文件     );     $currentCommand = 'su ......

重启网络 /etc/init.d/networking restart 清除DNS缓存 /etc/init.d/dns-clean start ......

http://www.kitterman.com/spf/validate.html http://mxtoolbox.com/ 可以到以下地址来测试DKIM和SPF服务是否正常： http://www.brandonchecketts.com/emailtest.php http://www.openspf.org/Why?show-form=1 ......

FTP服务器是平时应用最为广泛的服务之一。VSFTP是Very Secure FTP的缩写，意指非常安全的FTP服务。VSFTP功能强大，通过结合本地系统的用户认证模块及其多功能的配置项目，可以快速有效的搭建强大的多用户FTP服务。 首先我们考虑搭建FTP服务需要关注的都有哪些方面？比如我们最经常关注的有： 1、如何添加FTP用户？  2、如何临时冻结某FTP用户？  3、FTP用户登入后的默认目录？是否可以改变？  4、如何锁定FTP用户可访问的目录范围？  5、FTP用户可以有哪些访问权限？可否上传文件？ 我们将带着这些问题来探讨如何配置VSFTP以达到预定目标�......

postfix有四种不同的邮件队列，并且由队列管理进程统一进行管理： 　　1． maildrop：本地邮件放置在maildrop中，同时也被拷贝到incoming中。 　　2． incoming：放置正在到达或队列管理进程尚未发现的邮件。 　　3． active：放置队列管理进程已经打开了并正准备投递的邮件，该队列有 　　长度的限制。 　　4． deferred：放置不能被投递的邮件。 postfix日常维护 启动postfix postfix start 停止postfix postfix stop 重新读取postfix配置文件 postfix reload 立即投递队列中所有邮件(慎用) postfix ......

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http://xdsoft.net/jqplugins/datetimepicker/ DateTimePickerjQuery plugin select date and time Use this plugin to unobtrusively add a datetimepicker, datepicker or timepicker dropdown to your forms. It's easy to customize options. Source code on GitHub or download (zip). DateTimepicker Use mask DateTimepicker TimePicker DatePicker Inline DateTimePicker How do I use it? First include to page css and js files <!-- this should go after your </body> --> <link rel="stylesheet" type="text/cs......

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Background This article attempts to document how to configure Dovecot and domain & users’ mailbox quota sizes using information contained within PostfixAdmin and its associated tables. During PostfixAdmin install time, the database is requested where PostfixAdmin can store additional tables.  Selecting the same database as postfix itself neatly installs these additional tables, that can then be used by Dovecot to monitor mailbox quota sizes. Domain & User Quota Sizes There are two different types of quota sizes, one is set for the entire domain, the other can......