Bad address syntax. For example, a contact is configured with a 'targetAddress' attribute that has no address type or the ...

{4}: Bad address syntax. For example, a contact is configured with a 'targetAddress' attribute that has no address type or the fully-qualified domain name of the destination server has a trailing period. Troubleshooting: Verify the recipient address and resend the message. Also, verify that the 'networkAddress' property of the destination server has the correct computer name.