For many years Spamhaus has been top dog in the anti-spam world of DNSBL (Domain Name System Block List; also known as Realtime Blackhole Lists or RBLs). But Spamhaus is no longer a 100% free service. Even small nonprofits are now expected to pay at least $250 per year for a subscription to the Spamhaus DNSBL Datafeed Service. Now a new, free alternative to Spamhaus has arrived: the Barracuda Reputation Block List (BRBL), provided by well-known, open source-based Barracuda Networks. And Barracuda CEO Dean Drako says the company has no plans to charge for the service in the future. He says that BRBL (pronounced "barbell") "does cost us a little bit of money to run, but we think that the goodwill, the reputation and the understanding that Barracuda is providing the service will do us well in the long run."
Archmbox lets you list, move, and copy messages from one mbox mail file to another, primarily for archiving messages. This tool lets you easily move all messages that are older than a given date into another (possibly compressed) mbox file, and you can also grab or delete messages by matching regular expressions against message headers.
If you are into email like Tom Hanks and Meg Ryan were in the movie You've Got Mail, you probably want to be warned as soon as any message enters your mailbox. If you use Gmail, you can try one of several Gmail-specific applications that let you know when new messages arrive.
Over time, people tend to accumulate a large number of messages in various email accounts, most of which they never bother with again. The problem is particularly acute for administrator accounts that receive routine notifications of events that are viewed, if at all, no more than once. The archivemail tool lets you easily archive these old messages and thereby free up some disk space and improve your mail client's performance.
If you're looking to run a serious open source collaboration server, Yahoo's Zimbra Collaboration Suite (ZCS) should be on your short list. This Web 2.0 email and groupware server offers AJAX Web-based administrator and user interfaces, a variety of useful groupware features, and email import functionality.
Pidgin, formerly known as Gaim, is a popular Instant Messaging (IM) client for Linux. It works with 16 different IM services, including AIM, Yahoo, MSN, and Google, and can handle simultaneous connections to as many of them as you like. This 10-minute video is a brief introduction to Pidgin that shows how easy it is to install, in this case on OpenSUSE 11, how easy it is to set Pidgin up to use an existing IM account, and how to find and join an IRC channel with Pidgin.
A mail transport agent (MTA) provides the "plumbing" for your email system by taking mail from a client application such as Evolution or Mozilla Thunderbird and routing it to the correct location on the right machine. There are plenty of good MTAs, such as Postfix, Sendmail, and qmail, but these popular mail servers require a large amount of configuration, and may be overkill for users who merely want to set up an MTA to test a Web development project or need to move mail around locally. Smail is a better alternative for these scenarios because it generally requires no configuration, and its memory footprint is less than the more fully featured MTAs.
The usual practice of configuring your email client to retrieve email from your ISP's servers works well, but not for all situations. Suppose you add a laptop as a compliment to your desktop machine, or you'd occasionally like to use your spouse's computer to read your email -- you can run into problems trying to keep all of your email clients in sync. You can use IMAP (Internet Mail Access Protocol) instead of POP3 (Post Office Protocol), but then you need to store all of your email on your ISP's servers indefinitely, which has its own drawbacks. Here's a way you can set up a single machine on your own network to fetch and store your email and serve it to any number of email clients.
For enterprise system administrators looking for interoperability with Microsoft Exchange, but not the high costs associated with it, PostPath email and collaboration server could be a smart business investment. Boasting interoperability with Exchange environments for a third of the cost, thanks to its use of the Postfix mail server and many other open source components, PostPath provides drop-in capability and compatibility with Exchange environments without the need for making changes to Outlook on the client side. Being compatible with Exchange means that it can be managed using Microsoft's Active Directory infrastructure. The latest version, PostPath v3.1.2, adds support for Blackberry Enterprise Server and ActiveSync, allowing you to use mobile devices to access your email.
Scalix collaboration platform, with its latest release version 11.4, aims to be a good alternative to Microsoft Exchange. Based on the HP OpenMail platform, discontinued by Hewlett-Packard in 2001, it has been further developed by Scalix and now acts as an enterprise email and group calendar server with the option of integrating systems like ERP, CRM, and billing into the Scalix system using its open API. It is compatible with most LDAP authentication mechanisms, such as those in Windows Active Directory, Novell eDirectory, and Red Hat Directory Server. The most prominent feature of Scalix is its Exchange compatibility; you can use an Outlook client to access the Scalix platform. Scalix also provides an AJAX-based client that is nearly identical to Microsoft Exchange Outlook Web Access (OWA). Aside from Outlook compatibility, Scalix also claims to coexist peacefully with other existing Exchange email systems.
Bzzz.... bzzz...... bzzz...... That's not the sound of bees. It's the buzz surrounding new, open source Twitter competitor identi.ca. Creator Evan Prodromou sat down at OSCON in front of Linux.com's video camera and explained what identi.ca is all about and why it's suddenly such a hot item that he's been meeting with multiple venture capitalists -- and can be cavalier enough about those meetings that he canceled one to work on some code bugs that were bothering him instead. Code quality might be a reason for some of the buzz, which has resulted in so many stories about identi.ca that we might as well just link to a Google list of them.
PostPath is a drop-in Microsoft Exchange alternative based on the open source Postfix MTA. PostPath director of product management Sina Miri calls PostPath the "only" drop-in Exchange replacement, and he says that ability is the reason why his company makes PostPath available only with a proprietary license, despite its open source roots.
The Postal project includes three programs aimed at benchmarking mail server performance. The main program, postal, sends email messages to a specified list of destination addresses at a specified rate. Postal can let you see how fast your system can process incoming email and thus can help you measure improvements to your mail server when you are making software and hardware changes. For example, you can use postal to tell you whether switching to a different IMAP server will allow you to deliver more messages per second on the same hardware.
Email: businesses can't stay competitive without it, but the bigger a company is, the more of a headache managing an email server can be. There are plenty of email management tools on the market, but many are expensive or lack easy customization. AtMail recently added an open source option to its product line that offers many of the same features commonly found in other Web mail apps, but for the low, low cost of free.
When the need arises to send email from the command line, many folks first think of the mail(1) command. A better choice might be the email program, which gives you the ability to send email to an SMTP server over SSL, offers MIME support including ability to attach one or more files to your emails, uses an address book to store your recipients, and lets you digitally sign and encrypt your messages.
What's your normal routine when you log on in the morning? It's probably something along the lines of: pour cup of coffee, fire up Thunderbird, check your email, check your other email accounts that Thunderbird can't access, pour another cup of coffee. Well, here are a few Thunderbird extensions that may make your mornings go a little more smoothly.
OfflineIMAP allows you to read your email while you are not connected to the Internet. This is great when you are traveling and really need an attachment from a message but cannot connect to the Internet.
Do you struggle to keep tabs on your Thunderbird inbox? The SIMILE Seek extension might be the answer to your problems. The extension adds faceted browsing to Thunderbird, which allows you to search and manage your email messages in a radically different way than you are used to.
Linux distributions have relied on the venerable Sendmail package since the early days of Slackware. But Sendmail's rich mail server features aren't an ideal solution for the typical desktop user whose primary mail support is delivered through a remote ISP. That's the perfect place for a simpler solution: sSMTP.
JWChat is a Jabber instant messaging client that is written using only HTML and JavaScript. This means that you need not install a Jabber instant messaging client in order to use Jabber, assuming you already have a Web browser installed. A Jabber client that runs in a Web browser could be just the ticket for such uses as providing instant messaging to visitors to your Web site.