30.3 Dial-up Line + ETRN
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## 30.3 Dial-up Line + ETRN

### Information and Requirements

1. The company uses the domain `thirdcompany.com` and the primary MX record points to the computer where Kerio MailServer is installed (its DNS name is `mail.thirdcompany.com`).

2. The secondary MX record is directed to the SMTP server.

   `etrn.isp.com`,

   which supports the ETRN command and requires authentication by username and password.

3. The computer is connected to the Internet via a dial-up line (a static IP is assigned, to which the DNS name `mail.thirdcompany.com` is assigned).

4. The ISP enables sending outgoing email via their server

   `smtp.isp.com`,

   if the user authenticates by username and password.

5. During working hours (Mon-Fri 8:00-17:00) mail will be downloaded every hour and after working hours at 20:00, 0:00 and 5:00

### Implementation

1. In the Configuration → Domains section, create the primary local domain `thirdcompany.com` and enter the DNS name of the server `mail.thirdcompany.com`. When the line is up Kerio MailServer will function as the primary server for this domain. While the line is down email will be sent to a secondary server.

2. In the Domain Settings → Users section, create user accounts for all local users.

3. The server will connect to the Internet using a dial-up connection (that already exists in the system). In the Configuration → Internet Connection section, select Offline and tick Use RAS to connect to the Internet. Choose the requested dial-up connection and fill in the appropriate username and password.

4. All outgoing mail will be sent to a relay SMTP server. On the SMTP Delivery tab in the Configuration → SMTP server section, select Use relay SMTP server and enter its name — `smtp.isp.com`. The server requires authentication — enable the option Relay server requires authentication and fill in the appropriate username and password. Set the authentication type to SMTP AUTH Command.

5. Under Configuration → ETRN Download, define the following information:

   server: `etrn.isp.com`,

   domain: `thethirdparty.com`,

   Server requires authentication, enter username and password.

6. In the Configuration/Definitions/Time Ranges section, create a time interval Working hours, containing the range 8:00:00-17:00:00 valid from Monday through Friday, to be used in scheduling.

7. Set up scheduling for sending and downloading of messages. Add scheduling for every hour (Every 1:00) valid at the time interval Working hours and three schedulings for certain times (At) that will be valid all the time. For all schedulings tick the On-demand mail relay option (i.e. receiving mail using ETRN) but also Send mail in mail queue.

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30.2 Dial-up Line + Domain Mailbox | Contents | Chapter 31 Troubleshooting in Kerio MailServer