Mitel SME Server V5 with ServiceLink Podręcznik Użytkownika Pobierz pdf (Strona 15)

Chapter 4. Your Internet Service Provider (ISP)

Some Important Notes on Service List D (Multidrop Mail)

Service list D is applied to conﬁgurations where the publication of DNS records is not practical either because your IP address changes

frequently or because it is non-routable. Because there is no published address receiving incoming network connections, this conﬁguration does

not allow you to host a web page or FTP site using your SME Server V5 with ServiceLink.

In this case, e-mail is handled using a method called "multidrop", which involves temporarily storing all e-mail messages addressed to your

domain in a POP mailbox at your ISP until your server connects and fetches them. Your POP mailbox must be large enough to hold the e-mail

for your organization until it is fetched. If your primary ISP cannot supply this, you can use another ISP for your e-mail hosting.

As e-mail messages are delivered into the POP mailbox at your ISP, some of the addressee information is removed. To determine to whom the

e-mail message is addressed, your server uses several heuristics. This works very well for normal person-to-person e-mail. However, messages

from mailing lists (and other sources where the user’s account name is not present in the headers) cannot be delivered. Any e-mail that cannot

be delivered will be returned to the sender. If the e-mail cannot be returned to sender, it will be directed to the system administrator.

Some ISPs add a header to each e-mail message as it enters the POP mailbox to assist in determining the addressee. One common header tag is:

"X-Delivered-To". If your ISP does this, make note of the header tag used so that you can conﬁgure your server to look for it (explained in a

later section).

Because of the potential problems involved with delivery of e-mail to multidrop mailboxes, we strongly encourage you to consider other means

of mail delivery before resorting to using multidrop.

Terms used in ordering connectivity and services

ADSL (or DSL)

ADSL is a type of high-speed Internet access that uses regular phone lines and is available in many metropolitan areas.

Domain Name

This refers to the unique name attached to your organization on the Internet. For example, "tofu-dog.com" or "e-smith.com". If you don’t have

a domain name, your ISP can help you select one, ensure it is available, and register it.

DNS (Domain Name Service)

DNS, or Domain Name Service, refers to the software and protocols involved in translating domain names to IP addresses. Your server provides

DNS lookup services for your local network, and your ISP typically also provides you with the IP addresses of DNS servers. These servers do

not need to be conﬁgured into your server as the DNS server that is provided with your server will correctly resolve all local and Internet names.

DNS: Publication of DNS Address Records

The publication of DNS address information allows other DNS servers to look up your domain information. Your ISP must publish DNS

address records associating the name of your web server ("www.domain.xxx"), FTP server ("ftp.domain.xxx") and e-mail server

("mail.domain.xxx") with the IP address of your server.

DNS: Publication of DNS Mail (MX) Records

The publication of DNS mail (MX) records is the method used to inform Domain Name Services worldwide that all e-mail to your domain

("yourdomain.xxx") should be delivered to your e-mail server ("mail.yourdomain.xxx").

ETRN

ETRN is a command used for dialup solutions in order to retrieve e-mail temporarily stored at your ISP

Gateway IP Address

A gateway is the device on your network that forwards packets to and from the Internet. The gateway IP address is the IP address for that

device.

Internet News Service

If you want access to Internet newsgroups, your ISP will need to provide the IP address of an Internet news server. The ISP will provide

direction in conﬁguring your web browser or other newsreading software.

PPP

PPP refers to the "Point-to-Point Protocol" used when a modem connects to the ISP.

PPPoE

"PPP over Ethernet" is a modiﬁed version of PPP that is used over some high-speed ADSL connections to the ISP.

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