How to delete  queue of PowerMTA To delete / clear queue of PowerMTA: Use  pmta delete   Syntax : pmta delete [--dsn] [--queue=domain[/vmta] [--orig=addr] [--rcpt=addr] [--jobId=id] [--envId=id] [--accounting] Description :                  Deletes recipients from the queue. Although "--queue"'s default is */*, the command requires either --queue or --jobId to be entered explicitly, so that an accidental "pmta delete" command doesn't delete the entire queue. Messages are marked in the accounting file as deleted by administrator. Options : --dsn specifies that a DSN report should be sent. Using this option may slow the deletion process. No entry is written to the accounting file unless the --accounting flag is used as well. --accounting specifies that deletion information should be written to the accounting file. Using this option may slow...

An email server is a system or set of systems which handles the receiving and sending of email messages on the Internet. There are multiple types of email servers such as SMTP servers which use the Simple Mail Transfer Protocol that is used for e-mail transmission. An SMTP server usually runs in conjunction with an IMAP or POP3 server whose purpose is to provide e-mail retrieval and/or storage. Running an email server is not an easy task. It requires installing, configuring, understanding and maintaining a number of different services. Postfix is a free open source mail transfer agent (MTA). It is easy to administer, fast and as well as the secure MTA. It’s an alternative to Sendmail, which is the default MTA for RHEL. As you can imagine, there are number of different SMTP, POP3 and IMAP servers out there. In this article, we are talking Postfix, Dovecot and DKIM so we will walk you through the steps of installing and configuring an email server with Postfix...

One of the easiest way to protect and secure SSH logins by displaying warming message to UN-authorized users or display welcome or informational messages to authorized users. Display SSH Banner Messages Being a system administrator whenever configure Linux servers I always use to configure a security banners for ssh logins. The banner contains some security warning information or general information. See my example banner message which I used for my all servers. ############################################### ALERT! You are entering into a secured area! Your IP, Login Time,     Username has been noted and has been sent to the server administrator! This service is restricted to authorized users only. All activities on this system are logged. Unauthorized access will be fully investigated and reported to the appropriate law enforcement agencies. ################################################## There are two way to display messages one is usin...

The Sendmail program is a very widely used Mail Transport Agent (MTA). MTAs send mail from one machine to another. Sendmail is not a client program, which you use to read your email. Sendmail is a behind-the-scenes program which actually moves your email over networks or the Internet to where you want it to go..  This guide show you have to install and configure sendmail with virtual user and domains -  Installation  - Check if sendmail is installed or not: # rpm –qa | grep sendmail If it is not installed, then install the sendmail package using following command: # yum install sendmail sendmail-cf By default sendmail listen on local interface i.e 127.0.0.1 To configure the sendmail to listen to all interface at the host, just comment the following line in “sendmail.mc”: # vi /etc/mail/sendmail.mc From: DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl ...

Hi,  This tutorial will guide you to successfully install and setup zPanel CP on Centos 6 VPS in simple 10 steps. Preparation This guide is done on a cloud vps running CentOS 6.4 64-bit. This will also work on any CentOS 6 32-bit or 64-bit but for better compatibility make sure you use at least CentOS 6.3. Also, although zPanel is very lightweight panel in regard of resource usage . but it is strongly recommended to have at least 512MB of RAM. Install zPanel CP Step 1 – Prepare a fresh CentOS 6 VPS. Log in to your server via SSH (use Putty or Terminal) as root. Step 2 – Now lets download the installer file by following link- # for 64-bit use:   wget https: //github .com /zpanel/zpanelx/releases/download/10 .1.0_orig /installer-10-1-0-centos-64 .sh.x   # for 32-bit use:   wget https: //github .com /zpanel/zpanelx/releases/download/10 .1.0_orig /installer-10-1-0-centos-32 .sh.x   Step 3 - Now  you have to make i...

Each OSI layer contain a set of functions performed by programs to enable data to travel from a source to a destination on a network. In this article I will provide brief descriptions of each layer in the OSI reference model. Application Layer The application layer is the OSI layer that is closest to the user. This layer provides network services to the user's applications. It differs from the other layers in that it does not provide services to any other OSI layer, but only to applications outside the OSI reference model. Applications layer provide a platform to access the data of remote computer. The application layer protocols that you should know are as follows: SNMP (Simple Network Management Protocol)— Communicates status and allows control of networked devices. TFTP (Trivial File Transfer Protocol)— Simple, lightweight file transfer. DNS (Domain Naming System)— Translates a website name (easy for people) to an IP address (easy for computers)....

How to take backup of mails in outlook 2007. there is a very simple way to taking backup of mails 1.Opne outlook 2007 > tools >account > data files >open folder then close all other windows and copy outlook.pst file in a safe location To restore backup 1.Opne outlook 2007 > tools >account > data files > add > and give the location of outlook.pst file.