Spammers are not getting more creative and are using common file formats as attachments for pump-and-dump scams. This new white paper from GFI Software explains what makes spam such an unbearable problem and how spammers have switched from image spam to using PDF, Excel and ZIP file attachments. The white paper is free to download, and no registration is required for access!
GFi is a software company that has been around since before my IT career started. The white paper describes the recent tactics by spammers over the past few years. Attachment spam has been what I have seen the most lately. Spam is a problem for most of us, well, just about anyone with an email address. PDF spam is very annoying as it requires you to open a program in order to view your spam. Image spam is the lesser of the evil’s as it usually will open in your mail client. Both of these spam types continue to plague mail systems taking up bandwidth and storage space. One problem that can quickly get out of control is the space required to store spam. If you allow spam into your mail system, chances are, your users are not deleting it. When you start to consider that up to 90% of your incoming mail could be spam, you quickly can see a problem. If you could reduce spam or even eliminate it your backups and mail storage would certainly feel the relief.
In my environment, I am storing one terabyte of email on disk. I am confident that this is valid email text and attachments. Imagine if I were not filtering the spam out. First my users would complain all of the time. The managers would complain about their employeeÃ¢â‚¬â„¢s lost productivity time from manually cleaning spam, if they were kind enough to clean the spam. I would also be storing 10 terabytes in my mail storage system. Spam filtering is a must have. If your company is new then spam may not be a problem yet. If your company is an older company, you likely have already felt the sting of spam. In either case, allowing spam a way into your mail system is never a good idea.