1. in the e-mail message may be returned to the sender because the e-mail was sent to the address that is not tangible (disable) or does not contain your user name, e-mail, and then people who really do not want to receive e-mail has been received, but maybe someone else instead, which he may not respond to e-mail back, because it is not a business and therefore may not be aware that e-mail that is sent to a destination?2. a person is not accessible to everyone, and there may be a virus, came up with a document that was sent. If the information in your mail box is full, it is not possible to receive other information.
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