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1. Install Squirrelmail Debian 9

IntroductionThe 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 and a PTR record. the Sender Policy Framework DNS record is missing or it is misconfigured. the DomainKeys Identified Mail implementation is missing or it’s not properly set upThese are some of the basic properties that are being checked by the majority of proprietary and open source spam filters (including SpamAssassin).

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Passing these tests is extremely important for a well configured mail server.This tutorial will focus on installing and configuring : an open source implementation of the DKIM sender authentication system.It is assumed that the reader knows how to access the server over SSH, Postfix and Dovecot is already installed and configured , the host name and the FQDN are set up (, ) and the SPF record is in place. About DKIMDKIM is an Internet Standard that enables a person or organisation to associate a domain name with an email message.

This, in effect, serves as a method of claiming responsibility for a message. At its core, DKIM is powered by asymmetric cryptography. The sender’s Mail Transfer Agent (MTA) signs every outgoing message with a private key. The recipient retrieves the public key from the sender’s DNS records and verifies if the message body and some of the header fields were not altered since the message signing took place. Install OpenDKIMBefore starting the installation, a system update is recommended: sudo apt-get updatesudo apt-get dist-upgradeInstall OpenDKIM and it’s dependencies: sudo apt-get install opendkim opendkim-toolsAdditional packages will be listed as dependencies, type yes and press Enter to continue.

Configure OpenDKIMA couple of files must be created and edited in order to configure OpenDKIM.Nano will be used as an editor because it’s installed by default on DigitalOcean droplets and it’s simple to operate:. navigate with the arrow keys. exit without saving changes: press CTRL + X and then N. exit and save changes: press CTRL + X and then Y, and finally press EnterImportant: replace every instance of example.com with your own domain in all commands and configuration files. Don’t forget to save your files after editing.Let’s start with the main configuration file: sudo nano /etc/opendkim.confAppend the following lines to the end of the conf file (each parameter is explained below). Optionally, you can choose a custom port number for the Socket. Make sure that it’s not used by a different application.

Install Squirrelmail Debian 9

I am trying to upgrade my Debian Wheezy to Jessie, but it failed during the apt-get dist-upgrade, and now I am completely stocked.Here is what happens when I try a apt-get dist-upgrade: sudo apt-get dist-upgradeReading package lists. DoneBuilding dependency treeReading state information. DoneCalculating upgrade.