today I was messing around with networking between a WinNT 3.51 and Win 3.11 WfW machine on 86Box, the... thing that 3.11 called "mail" is very interesting
instead of having a dedicated server daemon with dedicated ports (SMTP, POP, maybe IMAP), what the mail app called a post office is basically just a shared folder on the network
I haven't yet gotten into the details, but it seems that to send mail one just needs to set up a mailbox with a name (done when configuring the mail app) on that shared folder
this would probably be super easy to implement because the client just has to write to the right mailbox file, but it's definitely interesting to operate
there was also a chat program, which I gotta admit was very rudimentary
the user can choose a specific computer on the Windows network to "dial" to (NOT a user, but a computer - probably since these versions were typically single user anyways, also dialing is what the app called starting a convo with someone)
the entire conversation is completely real-time text, with just two big boxes (the top box is for sending, the bottom is for receiving) for it