Directly from docs: "Note: Although SMTP can be configured in NuPoint (under Settings > Email in the Web Console), it is recommended to use the MSL Server Manager to take advantage of the complete range of configuration options. For example, secure SMTP can only be configured in MSL, not in the NuPoint interface."
Have you seen this? It is in the embedded help of Nupoint under Optional Features\Unified Messaging\Standard UM\Web Console\Configuration about half way down, this is literally what I was talking about (leaving email server blank part)
Configure Smart Host (SMTP Relay Server) Settings
NuPoint UM can communicate with the smart host through the default SMTP port number 25, or through secure (SSL) port 465. If you employ secure port 465 to connect directly to an SMTP relay server (smart host) such as Google Apps, you will be required to enter authentication details (User ID and Password) and your account may be subject to usage limitations. See Usage Limits if Connected Directly to Smart Host more information.
To configure the SMTP relay server settings:
Log in to the MSL Server Manager as "admin."
From the navigation tree, click Configuration, and then click E-Mail Settings.
Click Change.
Enter the following settings:
SMTP Server:
Server to use for outbound SMTP: The server can deliver outgoing messages via a corporate or Internet service provider's SMTP server, or can deliver messages directly to their destination by looking up mail exchanger records in DNS. If you are using a specific SMTP server, specify its hostname or IP address in this field. Otherwise, leave this field blank. Click Save to access other SMTP Server settings.
Destination port for outbound SMTP: Select either the default SMTP Port 25 (use cleartext) or secure SMTP Port 465 (SSL encryption).
Mail Server User ID: If you are using secure SMTP, enter the user ID required by the SMTP server.
Mail Server Password: If you are using secure SMTP, enter the password required by the SMTP server.
Note: For example, if you are connecting directly to the Google Apps SMTP relay server, you would enter smtp.gmail.com as the Server address, 465 as the Destination Port, and a valid user ID and password for a Google Apps or Gmail account.
SMTP email injection restrictions: This setting controls which networks will be allowed to send mail through this server via SMTP. Choose from one of the following three settings:
Localhost only – accept email only from applications installed on the server (default setting).
Accept only from local networks – accept email from local networks that are directly connected to the LAN. (These networks are on the same subnet as the server’s private interface.)
Accept from anywhere - accept all email.
Forwarding address for administrative email: By default, email to the administrator is sent to the user "admin" at the domain name configured on the server. You can override the default by entering an email address in this field.
E-mail sent for events: Select the system events for which you want to receive email notifications — Cleared, Indeterminate, Warning, Minor, Major, Critical. By default, Major and Critical are preselected.
Click Save.
Note: Although SMTP can be configured in NuPoint (under Settings > Email in the Web Console), it is recommended to use the MSL Server Manager to take advantage of the complete range of configuration options. For example, secure SMTP can only be configured in MSL, not in the NuPoint interface.
Usage Limits if Connected Directly to Smart Host
If NuPoint UM connects directly to the SMTP relay server, it may be subject to usage limitations. For example, direct connections to the Google Apps SMTP relay server are limited as follows:
The DNS settings on the local server must be able to resolve to the smart host (smtp.gmail.com). The corporate DNS settings can be configured under "Domains" on the MSL Server Manager.
Direct connections to the Google Apps SMTP relay server must be made through a secure SMTP Port (465) using a single, authenticated user account. As a result of this setup, Google's SMTP server delivers all email messages with the same "Reply To" address. For example, if someone from extension 1120 leaves an email message for mailbox 4009, the message will contain a unique "From" name of 1120 but a common "Reply To" address of nupoint.voicemail@domain.com. To alleviate this limitation, configure a Google Apps account with a name that indicates the messages are originating from a NuPoint voicemail server; for example, nupoint.voicemail@corporate.com.
If you connect directly to the SMTP relay server using a single, authenticated user account, the account will be subject to sending limitations to prevent email spamming. For example, Google Apps has a sending limit of 2,000 email messages per day. Once that limit is reached, the account will be locked for 1 to 24 hours, preventing further emails from being sent. In addition, the account will also be locked if too many emails are sent during a short period of time. While the account is locked, Google rejects new email with a "Daily sending quota exceeded" error and the event is logged in /var/log/qmail. (Note that Google controls the account lockout triggers and time periods, and does not publish the
Because sending limitations apply to all SMTP emails sent from your system (including emails generated by the alarm manager, fax confirmation, and Advanced UM Blackberry users), direct connections to Google Apps should be implemented only by smaller organizations. A safe limit is 80 user mailboxes, based on typical call/port usage patterns.
Email Whitelist
In some cases, Google Apps may treat email from NuPoint UM as spam. To correct this problem, you must add the NuPoint server to the email whitelist on the Google Apps domain.
To add NuPoint the list of accepted senders on the Google Apps email whitelist:
Log in to the Google Apps administrator control panel:
https://www.google.com/a/cpanel/yourdomainname Click the Settings tab and select Email.
Locate the Email Whitelist section and enter the external IP address(es) of the NuPoint UM server.
Click Save.
