Your Internet Consultant - The FAQs of Life Online
America Online. user@host.domain
AppleLink. user@host.domain@internet#
This is the one of the only cases that I know of where you'll send e-mail with two @s in the To: line. I don't know why they do it that way; it's bad form. To send mail from AppleLink, the destination address must be fewer than 35 characters.
AT&T Mail. internet!domain!user
For example: internet!rahul.net!waffle.
BITNet.
Methods for sending mail from BITNet to the Internet vary depending on what mail software is running at your BITNet host. In the best case, users should be able to send mail to user@host.domain. If this doesn't work, try user%domain@gateway where gateway is a BITNet-Internet gateway site (such as cunyvm.cuny.edu, pucc.princeton.edu, or wuvmd.wustl.edu.)
CompuServe. >INTERNET:user@host.domain
Connect. DASN
Make the first line of the message "user@host.domain"@DASN
Fidonet.
user@machine.site.
Use the normal Internet address followed by ON 1:1/31.
GEnie. user@host.domain@INET#
MCI Mail.
At the To: prompt, type your recipient's name followed by (EMS)
For instance, John Smith (EMS). At the EMS: prompt type
INTERNET. Finally, at the Mbx: prompt type
user@host.domain.
WWIVnet.
user#machine.site.domain@506.