> My understanding is that packet radio has been allowed in part of the > HAM band and in part of the Marine SSB band for quite a long time. > > Curtis
That's correct Curtis. In fact, worldwide electronic mail was possible with packet and the worldwide BBS network long before commercial Internet email was available. And we've been using Postfix to relay between our packet network and Internet email for years. AX.25 doesn't really have much to do with it. It's a reasonable choice for a link layer protocol for operation over a low-speed, lossy (radio) medium. That makes it useful in the HF/VHF/UHF bands where channel bandwidth is limited. In fact, we run SMTP over AX.25 all the time. It is really the channel speed, not the link layer protocol, that limits message size and the use of native email clients and email client protocols like IMAP, since they are far more chatty than the packet radio protocol for sending/receiving messages. But hams also have frequency allocations in the microwave (read WiFi) bands and can run just as fast as any other commercial product there. Those high speed links enable the use of native email clients. And that drove my questions about controlling TLS and encryption. I guess the ON-topic part of this is understanding the reason behind the need to control the use of TLS and encryption on a client-by-client or IP-address or other basis. It's very real and very current, and not just for "old" or "legacy" stuff. But, before Wietse kicks me off the list ;-) please let's get back to Postfix. Folks can contact me off list about amateur radio if desired at n6mef at mefox dot org. Michael N6MEF
