Microsoft KB Archive/139139

= Microsoft Knowledge Base =

Cannot Send E-mail to Address Containing Exclamation Point
Last reviewed: October 7, 1997

Article ID: Q139139

The information in this article applies to:


 * The Microsoft Network versions 1.0, 1.05, 1.2, 1.3, 2.0, 2.5

SUMMARY
You cannot send e-mail messages to addresses that include an exclamation point (!). For example, you cannot send an e-mail message to the following address:

tac!jms!smith@txttac.attmail.com

MORE INFORMATION
If you send e-mail to an address with an exclamation point, you receive a non-delivery message from the System Administrator stating "Mailbox not available."

The Microsoft Network does not allow an exclamation point as part of an e-mail address. An exclamation point indicates path information within the recipient's internal e-mail system and is not part of Internet e-mail syntax.

When someone sends you an e-mail message, the message header contains that person's valid e-mail address.