SkyPoint
Communications is a full service Internet Service Provider.
ETRN Configuration
ETRN Configuration Many
dial on demand sites experience burst delivery of their mail which may or
may not coincide with their connectivity to their provider. ETRN is a facility
offered by many SMTP mail hosting sites that allows one to make the delivery
more predictable. However, sites must be correctly configured to signal the
mail router that it is up and available to receive the mail.
The provider typically
will attempt immediate delivery, and failing that will queue the mail for
later delivery. The mail router assumes full time connectivity, but is robust
in that it will retry upon failure. ETRN can be used to short-circuit the
queue run timing so that your mail can be dequeued and received immediately.
The exact setup instructions vary by mail server type. Instructions for common
servers are listed below.
For SkyPoint customers,
ETRN should be used using the DNS name 'etrn.skypoint.net'. This host will
typically be used to queue mail separately from general delivery 'smtp.skypoint.net'
so that ETRN operations will not interfere with normal SMTP operations of
the central mail server. The argument provided for ETRN should be your mail
host or your mail domain. The mail host is the text in your email address
after (and not including) the '@' symbol. Example: john.q.sysadmin@mail.mycompany.com
configuring ETRN
| Correct:
|
ETRN mail.mycompany.com
ETRN mycompany.com |
| Incorrect:
|
ETRN @mail.mycompany.com
ETRN skypoint.com
ETRN SMTP |
References:
Microsoft Exchange:
http://www.mircosoft.com/exchange/55/whpprs/ConnectInternet.htm
Novell GroupWise:
http://www.novell.com/GroupWise/administration/gw55/us/gia00005.htm#smtpdialup
Unix:
http://www.tuxedo.org/~esr/fetchmail
The implementations are
varied, but your 'connect to internet' dial on demand trigger should include
something like this
telnet etrn.skypoint.com
25 <<EOF
EHLO mail.mycompany.com
ETRN mail.mycompany.com
ETRN mycompany.com
QUIT
EOF
Otherwise, you may use
this shell script. It contains a built in manual
page documenting usage, as well as the instructions provided above.
