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Spammers often like to use a dictionary type of attack to reach users’ Inboxes. You have probably noticed that most spam now appears to come from your own email address. A dictionary attack is where spammers create or work off a list of addresses starting with the letter A, like Aaron@domain.com, and move down theRead more

In Part 1, I showed you how to use telnet to determine whether or not your mail server is having communication problems on port 25. In this part, we’ll see how to test address resolution to check for DNS Server problems. If the recipient email address never receives the email, verify that the domain name,Read more

It’s not unusual to get an end-user complaint about problems sending email or login attempts timing out. These issues often point to a specific client configuration or browser setting. But what if the situation involves more than a simple client feature, and has been reported by many end users?  The first step is to determineRead more

It’s almost 2 o’clock in the morning and your boss is expecting an important email. What is so important to keep him waiting up until the wee hours of the morning? Well, only the signing of the star pitcher for his Major League Baseball team. This player figures to be the centerpiece for the team’sRead more

You just completed installing a brand new mail server, and the mailboxes have been configured and enabled. The newly mounted server is a monster: able to take punishment, heavy loads, and process data in a flash. The quarantine and filter databases have been placed in a DMZ environment separate from the rest of the network,Read more