The Online World resources handbook

Electronic mail, telex, and fax http://home.eunet.no/~presno/bok/7.html
to send an email from either mailbox to the other. If one of them succeeds, then the
mailer header of the received message may explain how to send a reply.
Example: This is a typical Internet mailer header on a message received from an
X.400 service:
From MSGSUPPORT@smc tm22.sprint.com Thu Oct 27 02:44:55 1994
Return Path:
Received: from sprintf.merit.edu (sprint.com) by grida.no with SMTP
id ; Thu, 27 Oct 1994 02:44:52 +0100
Received: from sprint.com by sprintf.merit.edu (8.6.5/merit 1.0)
id VAA01624; Wed, 26 Oct 1994 21:45:12 0400
X400 Received: by mta merit in /PRMD=internet/ADMD=telemail/C=US/;
Relayed; Wed, 26 Oct 1994 21:44:54 0400
X400 Received: by /ADMD=TELEMAIL/C=US/; Relayed; Wed, 26 Oct 1994
21:41:29 0400
Date: Wed, 26 Oct 1994 21:41:29 0400
X400 Originator: MSGSUPPORT@smc tm22.sprint.com
X400 Recipients: non disclosure:;
X400 Mts Identifier: [/ADMD=TELEMAIL/C=US/;UGJE 6721 7167/27]
X400 Content Type: P2 1984 (2)
Content Identifier: VL72373 27
From: MSGSUPPORT@smc tm22.sprint.com
Message Id:
To: PRESNO@GRIDA.NO
Subject: RE: HELP
Here, it is simple. Both the Return Path line and the From: line have the correct Internet
address.
If the mailer header does not contain such information, converting the X.400
addresses into a RFC 822 addresses may well be regarded as a black art. Also, note that
you cannot send email from the Internet to all X.400 users on the globe. Some gateways
DUH RQO\ DFFHVVLEOH IURP FRPPHUFLDO VHUYLFHV
For example, continued attempts to send from an Internet mailbox in Norway to an
X.400 address in a Nigerian company failed, while mail to/from CompuServe worked
well.
FidoNet
Users of this network can send and receive mail to/from the Internet. For example, a
FidoNet user may use the following method to send to my Internet address:
Send the message to user UUCP at 1:105/42. The first line of the TEXT of
the message should contain:
To: presno@eunet.no
Add a blank line after the address before entering the text of your message.
FidoNet addresses are composed by three or four numbers;
zone:net/node
or
zone:net/node.point
The FidoNet address 1:105/42 has three elements. "1:" tells that the recipient lives in
Zone number 1 (North America). 105/42 refers to Node number 42, which receives mail
through Net number 105. This node has an automatic gateway to the Internet.
Another example: Jan Stozek is sysop of "Home of PCQ" in Warsaw, Poland. The
Node number of his BBS is 10. He receives mail through Net number 480. Poland is a
country in Europe, Zone number 2. The address to his system is: 2:480/10. His user
name is Jan Stozek.
You can send an Internet message to anyone in FidoNet by using the following
template (on one long line):
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