Hi Jim,
Thanks for your post and Ace's good suggestions.
I am with Ace that the " Unable to relay" issue is possibly caused by the incorrect IMAP authentication for the SMTP server. The following examples demonstrate how Exchange Server accepts and
relays mail by using authenticated relaying:
" An anonymous user connects to the SMTP virtual server and attempts to deliver mail to an internal user in the Exchange organization.
In this situation, the SMTP virtual server accepts the message because it is destined for an internal domain and because the user exists in Active Directory.
" An anonymous user connects to the SMTP virtual server and attempts to deliver mail to an external user in an external domain.
In this situation, the SMTP virtual server rejects the mail because it is destined for an external domain for which the Exchange server is not responsible. Because the user is not authenticated, the
SMTP virtual server does not relay this mail outside of the Exchange organization.
" A user connects to the SMTP virtual server using a Post Office Protocol (POP) or Internet Message Access Protocol (IMAP) client (for example, Microsoft Outlook? Express), authenticates,
and then attempts to send a message to a user in an external domain.
In this situation, the e-mail client connects directly to the SMTP virtual server and authenticates the user. Although the message is destined for a remote domain, the SMTP virtual server accepts and
relays this mail because the user is authenticated
To resolve this issue, configure Outlook Express to send authentication credentials:
1. On the Tools menu, click Accounts.
2. Click the current user account.
3. Click Properties.
4. Click the Servers tab.
5. Under Outgoing Mail Server, click to select the My server requires authentication check box.
6. Click Settings.
7. In the Logon Information dialog box, select one of the three following options:
o Use same setting as my Incoming Mail server. The authentication credentials in the Incoming Mail Server option.
o Log on using. Type the user account and password of the current user.
o Log on using Secure Password Authentication. An authentication credential is displayed every time a message is sent.
8. Click OK until the Internet dialog box appears, and then click Close.
In addition, here are some articles you may refer to configure your SMTP server authentication so that it can relay for IMAP client.
Prevent anonymous access on internal SMTP virtual servers and dedicated SMTP virtual servers for IMAP and POP clients.
http://technet.microsoft.com/en-us/l...EXCHG.65).aspx
Setting Relay Restrictions
http://technet.microsoft.com/en-us/l...EXCHG.65).aspx
550 5.7.1 Unable to relay for
http://social.technet.microsoft.com/...8-1e264f218aa1
Hope this helps.
Best regards,
Robbin Meng(MSFT)
Microsoft Online Newsgroup Support
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