Tags: email

Open-Source Developers Targeted in Sophisticated Malware Attack

Attackers have targeted developers present on GitHub since January with an information-stealing program called Dimnie. The attacks started in January and consisted of malicious emails specifically crafted to attract the attention of developers, such as requests for help with development projects...
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Three Overlooked Lessons about Container Security

I’ve just joined container security specialists Aqua Security and spent a couple of days in Tel Aviv getting to know the team and the product. I’m sure I’m learning things that might be obvious to the seasoned security veteran, but perhaps aren’t so obvious to the rest of us! Here are three aspects...
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Blocking of International Spam Botnets with a Postfix Plugin

This article contains an analysis and solution for blocking of international SPAM botnets with on postfix mail servers by using a postfwd plugin which analyses the sasl connects by country.   One of the most important and hardest tasks for every company that provides mail services is staying out of...
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OpenSSL
In this tutorial, Carla Schroder explains how to protect your Postfix/Dovecot mail server with OpenSSL.

OpenSSL For Apache and Dovecot: Part 2

Last week, as part of our meandering OpenSSL series, we learned how to configure Apache to use OpenSSL and to force all sessions to use HTTPS. Today, we'll protect our Postfix/Dovecot mail server with OpenSSL. The examples build on the previous tutorials; see the Resources section at the end for...
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4 Ways to Send Email Attachment from Linux Command Line

Once you get familiar to using the Linux terminal, you wish to do everything on your system by simply typing commands including sending emails and one of the important aspects of sending emails is attachments. Especially for Sysadmins, can attach a backup file, log file/system operation report or...
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Mail server
In the final part of this tutorial series, we go into detail on how to set up virtual users and mailboxes in Dovecot and Postfix.

Building an Email Server on Ubuntu Linux, Part 3

Welcome back, me hearty Linux syadmins! In part 1 and part 2 of this series, we learned to how to put Postfix and Dovecot together to make a nice IMAP and POP3 mail server. Now we will learn to make virtual users so that we can manage all of our users in Dovecot. Sorry, No SSL. Yet. I know I...
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Dovecot email
Part 2 in this tutorial shows how to use Dovecot to move messages off your Postfix server and into your users' email inboxes.

Building an Email Server on Ubuntu Linux, Part 2

In part 1, we installed and tested the Postfix SMTP server. Postfix, or any SMTP server, isn't a complete mail server because all it does is move messages between SMTP servers. We need Dovecot to move messages off your Postfix server and into your users' email inboxes. Dovecot supports the two...
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mail server
In this series, we will show how to build a reliable configurable mail server with Postfix, Dovecot, and OpenSSL on Ubuntu Linux.

How to Build an Email Server on Ubuntu Linux

In this fast-changing world of containers and microservices it's comforting that some things don't change, such as setting up a Linux email server. It's still a dance of many steps and knitting together several different servers, and once you put it all together it just sits there, all nice and...
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GPG Sync Simplifies Encryption Key Management

Open source project GPG Sync makes it easier for organizations already using GPG to encrypt email messages to manage different user keys. In all the discussion about using encryption, a critical point keeps getting lost: It's difficult to work with, and it's even harder to deploy it at scale....
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5 Sysadmin Horror Stories

Happy System Administration Appreciation Day! The job ain't easy. There are constantly systems to update, bugs to fix, users to please, and on and on. A sysadmin's job might even entail fixing the printer (sorry). To celebrate the hard work our sysadmins do for us, keeping our machines up and...
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