The e-mail configuration portion of the Small Business Server Internet Connection Wizard creates a Simple Mail Transfer Protocol (SMTP) connector for your Exchange Server to send and receive Internet e-mail. The wizard can also configure the Microsoft Connector for POP3 Mailboxes to download e-mail from an ISP's Post Office Protocol 3 (POP3) account.
To complete the e-mail configuration, you will need the following information from your ISP:
- If you are using Exchange Server for Internet e-mail, you must obtain an e-mail domain name registered through an accredited Internet registrar.
- If you want to send e-mail to the Internet through your ISP's e-mail server (relay), you must obtain the server name or IP address to your ISP's SMTP smart host. A smart host is a mail server that is configured to forward outgoing e-mail to the Internet.
- If your ISP holds incoming e-mail until your Exchange Server sends a signal notifying your ISP's e-mail server that it is online and ready to receive e-mail, you must obtain the DNS name or IP address of your ISP's e-mail server. Additionally, ask your ISP if your Exchange Server will send an ETRN signal or TURN after Authentication signal.
- ETRN (Enhanced TURN) is a standard mail signal protocol. It sends an ETRN signal to your ISP's e-mail server indicating that the Small Business Server is online and ready to receive e-mail. The ISP server then determines the correct IP address for the Small Business Server computer by checking its own DNS records for the domain name, and then establishes an SMTP connection to the Small Business Server computer to deliver the e-mail.
- TURN after Authentication is another form of the TURN signal that is utilised by some e-mail servers, such as Exchange Server. With a TURN after Authentication signal, a static DNS record for the e-mail domain is not required. Instead, credential information is passed along with the TURN signal to the ISP's e-mail server. This way the Small Business Server computer authenticates itself to the ISP's e-mail server, and indicates it is online and ready to receive e-mail. The ISP server then delivers the held e-mail to the Small Business Server computer using SMTP.
If you currently have POP3 e-mail accounts that you want to continue to use, it is recommended that you configure the Microsoft Connector for POP3 Mailboxes to retrieve e-mail from these accounts and deliver it to your Exchange Server, rather than configuring each account from a client computer. This ensures that all e-mail is sent through Exchange Server on the Small Business Server. It also allows for a unified Inbox (all incoming e-mails can be viewed through the user's Inbox) and the e-mail is saved in the Exchange Server store where it can be properly backed up.
To configure the Microsoft Connector for POP3 Mailboxes, you can use either the Small Business Server Internet Connection Wizard, or use the connector snap-in available through the Exchange System Manager. When configuring the connector, there are two mailbox types to choose from, as follows:
- Global ISP Mail Host (Global Mailbox)łA global mailbox is one in which a single POP3 mailbox account is used to receive all e-mail for one company, regardless of the name specified in the e-mail address. For example, UserName1@microsoft.com and UserName2@microsoft.com both deliver to a generic company mailbox called company@microsoft.com.
When the mailbox is accessed by the Microsoft Connector for POP3 Mailboxes, Exchange Server reads the recipients on the To and Cc lines and then forwards the message to the corresponding Exchange users. In a global mailbox, blind carbon copy (bcc) is not supported. When bcc mail is delivered, the delivery information for the recipients is removed and no information is available for the connector to use for routing.
- User Mailbox A user mailbox is one in which e-mail for a single recipient is stored in a single POP3 mailbox account at an ISP. When the mailbox is accessed by the Microsoft Connector for POP3 Mailboxes, the connector modifies the delivery headers to change the To line of each e-mail to the specified Exchange recipient.
