I need some help with the following IT question. Your help is greatly appreciated.

Thanks

Some mailing list software rewrites the From: lines in the header of any message sent to a list to make it appear that the message was sent from the list instead of an individual. The advantage is that if a recipient replies, everyone on the list receives a copy of the reply. What is the danger of rewriting headers? Hint: imagine that one of the addresses on the list contains a typo.

 

Don't know much about e-mail headers, but in your scenario, if one of the addresses in the list contains a typo, wouldn't the message sent to that invalid address (assuming it's not taken by someone else) bounce back to all of the other addresses in the list?

 

yup, what he said. it will start to bounce back to the list, which will forward to the list recipients (and the invalid address), which will bounce again and over and over and over again. mail servers don't like that