Computer Generated Letters without signature

Many official letters received from many companies/organisations quote the following “This is a Computer Generated and does not require signature”

I wonder if any of the persons reading this have a given a thought to it.

What does it mean by “The computer generated letter …..”?

1. It will not have any mistakes
2. It should be taken for granted
3. It cannot be challenged

 Probably the more appropriate way of putting it should be as below

“This letter is computer generated from our existing records and carry no signature. If however, any clarification/error is observed by the addressee the same must be brought to the notice of the originator of this letter. Nil communication within 4 weeks from the receipt of this letter will mean concurrence on the subject by addressee”

Most importantly such letters should clearly indicate the senders address for communicating back if required. Failure to do so must make such letters invalid legally.