Tuesday, October 6, 2009
Mailbox unavailable. The server response was: 5.7.1 Unable to relay for (email address).
have done some reading about this and it seems that most people are able to fix this error by doing the following:
1) Right click on Default SMTP Virtual Server and select properties
2) Select the access tab
3) Click the Relay button
4) Click the Add button
5) Type in your ip address
1) Right click on Default SMTP Virtual Server and select properties
2) Select the access tab
3) Click the Relay button
4) Click the Add button
5) Type in your ip address
# posted by CHANDU @ 2:17 PM 
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