Below is only a suggested method for running Inet 4.0 under Spitfire 3.5.

Shakey Jake's (1:202/1324) is currently running Inet 4.0 on a 2 node
Spitfire 3.51 BBS with Frontdoor 2.12/SW.  INET has also been extensively
tested with Spitfire 3.51 and Intermail 2.29G.

1.  The way Inet is set up on Shakey Jake's is that incoming Internet Email
is placed in the FD netmail directory by FD.  This directory is named:
C:\FD\MAIL.  Then when INET is run, it reads Internet Email right out of
Frontdoor and replies are written right back into Frontdoor.  One additional
feature is the ability to reply to Netmail in INET while you're logged on
to your board.  On Shakey Jake's, INET is run in the SFLOGON.BAT file so that 
users can read and reply to their Email as they log on.  It's also run from 
the Message Menu extension as Internet Email Functions, using Mike Robinson's 
fine menu extension program MultiMenu.

2.  Listed below is the actual INET.CFG file used on Shakey Jake's:

Sysop Jacques shake
SysopSecLvl 30
RegistrationKey 0
Origin 1:202/1324
Gate 1:202/777
GateName UUCP
DomainName @f1324.n202.z1.fidonet.org
ToLineFormat To: $\r
ReplyLineFormat Reply-To: $\r\r
MsgAreaName Shakey Jake's Free Internet Email
Flags CRA LOC PVT K/S A/S
AppendText C:\INET\APPEND.TXT
AddressBook
MaxFileDays 120
MaxAddresses 30
PublicBookSecurity 30
PostSecurityLevel 10
Editor
MsgInfo msg.inf
MsgInfoFormat FROM TO SUBJ MSGNUM MSGAREA PRIVATE
MsgTemp msgtmp
MessageCost 0
LogFilePath c:\inet
Outbound c:\fd\mail
SemaPhore c:\fd\fdrescan.now
MsgBasePath
MsgBaseType NONE
MsgBoard 0
WriteTo
CheckFor REPLYADDR
CheckFor REPLY-TO:
StartCharacter <[(
EndCharacter >])
ReplaceWithSpace _.
LinesToCheck 30
LogLevel 2
LogSize 150

This config file works but feel free to modify it as needed...

3.  Here is a sample SFLOGON.BAT file:

cd\telecomm\sf
c:\inet\inet /read=c:\fd\mail /personal /new /node1

Inet should be run from the node directory in order to find the appropriate 
drop file (door.sys).  The /personal switch looks for personal mail for the 
current user.  The /new switch will cause it to only show unread messages.
The sysop can use this feature to read and reply to Netmail...  
Note: Messages previously read in Frontdoor won't show up as new.

4.  The only thing left to do is add the Internet Email Functions options 
somewhere on your board.  It can be added as option K from any menu, or it
can be set up as a door or as any menu extension.  On Shakey Jake's it is
located in a menu extension off of the Message Menu, using Mike Robinson's 
excellent program MultiMenu.  Here is a sample menu from Shakey Jake's:

       MultiMenu for any BBS

<1>  Lakota Offline Mail Reader
<2>  SFMail Offline Mail Reader
<3>  Jetmail Offline Mail Reader
<4>  SFQuick Offline Mail Reader
<5>  Internet Email Functions

The important portion of the batch file to run option 5 above is:

Option 5:
c:\
cd\telecomm\sf
c:\inet\inet /read=c:\fd\mail /personal /node1

5.  As you may have noticed above, I don't use Replychk.  Since I'm reading 
Email directly out of the Frontdoor Netmail directory, Replychk is not
needed.

6.  This is just one way of running the Internet Connection program in
Spitfire.  There are many other possibilities including combinations of 
tossing Email into the SF message base.  I chose this option and it works.
If you want to observe Inet in action; call Shakey Jake's at (619)448-6470
(28,800) or at (619)448-2658 (14,400).  If you have questions, I can 
always be contacted in the Spitfire echo as well as the Omega_Soft echo.
Mark Williamson, the author of INET also frequents the above echos and is
very prompt in responding.

Jacques Shake