With every advancement in anti spam software, the spammers become more desperate and more inventive. They have even discovered how to take advantage of standard operations of most e-mail servers.
It's called NDR (Non Delivery Receipt) Spam or backscatter. Have you ever received a message in your inbox saying that something you sent was undeliverable or bounced? Spammers are now using this courtesy response to get their information in your inbox. They send e-mails to addresses that do not exist, and say that it is from you. Or they use your e-mail address as the sender for their entire, enormous mailing list. Then when any messages bounce back they are sent to your e-mail address. This is possible simply because email servers cannot authenticate that the person sending the message is in fact the owner of the address being used.
How would a spammer get these e-mail addresses? It is not unusual for a company or person to post a contact e-mail address on a company or personal website. Spammers can collect these, and use them as their own address for their enormous mailing lists, thereby eliminating the need them to deal with the inevitable 'Return To Sender' NDR e-mails.
This type of spam can be quite dangerous. Because technically the message is coming from the reader's own mail server, the chances of them opening it, and anything that might be attached, is much higher then with your typical spam. And for the exact same reasons it is considered much more insidious as well because it's much harder for a spam blocker to filter out. The most likely outcome of NDR spam is that a single domain will be spoofed as the sender of a spam message, and then be inundated by NDR messages from the long list that the message was sent to, overwhelming a company's exchange server. At its simplest it can overwhelm an exchange server, and force a user to waste time sorting through their inbox.
Little can be done by an individual to eliminate this type of spam, but an internal IT manager can turn off the option to have NDR messages produced at the mail sever. Spam filters can also be put in place to delete any messages that contain frequently used spam content, or subject-line only messages with no content. This can make it a little more difficult for users to send and receive their e-mail, but if they are made aware of the restrictions necessary to maintain optimum operations, problems can often be avoided.
In general this type of spam causes a significant nuisance to users and system administrators, but as with other types of spam, the technology is even now being developed and implemented to put another road block in the way of backscatter.
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Long-term effects of high heels?
By: NopoliBeen | 06-02-2008
Will wearing high heels all the time ruin my feet as I get older? Will I start to have back/leg problems?
Spelling, same, meaning,
By: mdchaskar | 05-01-2008
Which is the word, which has the same spelling, either u read forward or backward. How many English words one can spell out like this. Pl name those words.
Complience
By: prouler | 17-12-2007
My son was medically corseted at the age of 8 after 18 months in a plaster body cast to hold his spine in an absolute errect posture. The medical corsets had strong flexable boning which allowed him to bend to some degree forcing against the bones. Now aged 12 he has been fitted with a most severe medical corset that has 16 rigid steel bones including a very wide front bone and two rear bones each side his spine that are bent to keep his spine in a very arched position. This corset unlike the others is much longer extending well on his buttocks, as low at the front as possible and tight under arm. Apart from this the corset has to be fastened to what can only be described as unforgiving. Although he tries hard, bending is no longer an option against the steels. Although he has been good with his previous corsets he is finding this one very difficult and is refusing to comply by constanly loosening it. He has to endure it 23 hours a day fully tightened. He has been told he must persevere with this. Has anyone any idea how to stop it being loosened. It is rear multiple strap and buckle fastening.
What can i do to melt away the lumps at the top of ...
By: lumpy | 27-11-2007
what can i do to melt away the lumps at the top of my buttocks on each side of my hips...the lumps are not directly on my side but they are back a little bit...I hope someone knows what I am talking about because its kind of hard to explain..please help
Is tennis bad for your back?
By: Parle-G | 21-04-2007
I recently started having back pain, but I didn?t quit my tennis playing, can tennis do any damage to my lower back?
How to got better posture
By: leeblack | 09-12-2006
I have been told that practicing good posture could overhaul my mind and body , they way I breathe (easier!), even the way I think. How should I start is there any exercise I can do in my home ?
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