Tag Archives: Exchange Server

As the Internet begins to transition from IPv4 to IPv6, email admins will need to transition from IP blacklists to other antispam mechanisms.

Directory harvest attacks are one of the many threats email administrators must deal with. SMTP tarpitting is an effective defence. This post goes over the mechanics of the attack, and the details of the defence.

Earlier this week I was talking with a client and discovered that they had not received an important email that I sent them that morning.  After a brief investigation we found the email in their Outlook Junk email folder.  This …

Anyone who uses the internet whether for business or for leisure has had first hand experience with spam at some point in time.  Spam is a problem that plagues the internet and affects us all in some way.  Like most …

After an organisation has made the decision to invest in an anti-spam solution, often the next consideration is where within their network infrastructure should the anti-spam system be located.  When making these decisions it is helpful to understand common anti-spam …

Protection of email traffic flowing between hub servers and separate servers that store mail box accounts is established through encryption in an Exchange 2007 environment. So interception of emails transported between the hub and mail server is nearly prevented with …

Most of the articles you’ll read on a blog such as this will describe how to protect yourself from certain types of spam.  Most of the articles I’ve written so far do exactly that.  Today I’m going to add another …

Have you ever wondered how spammers manage to find your email address and start sending you junk and scam emails?  In this post I’ll describe three ways in which spammers are able to get their hands on lists of valid …

Anti-spam companies around the world generally agree that the average volume of spam travelling through the internet is as much as 90% of total global email traffic. That is an alarming, but not surprising statistic.  Spammers have relatively low business …

When talking about email servers the term “open relay” means a mail server that allows anyone to send email through it to any destination.  An email server may become an open relay through accidental misconfiguration by the server administrator, or …