Re: Sending email over HF using Free software

Hi,
You can use UUCP to integrate the email stack to HF. Gnuradio I think
better be used for the layer 0 in the network stack. This is what I
wrote to integrate UUCP to any HF tnc (ardop and Vara supported for now):
https://github.com/Rhizomatica/hermes-net/tree/main/uucpd

Cheers,
Rafael

On 8/17/22 10:57, Andrew Back wrote:
> On 17/08/2022 07:34, badt wrote:
>> Hey,
>>
>> I'm looking for a way to enable my existing Postfix/Mailman mailing
>> list server
>> with HF capability- to both send, and receive PGP-signed, or encrypted
>> email
>> over radio reliably, as well as have the option to have some
>> transmissions
>> either re-transmitted over the Internet.
>>
>> Apparently there's Winlink[1] and it's what the Americans use, however
>> it seems
>> if not proprietary, then heavily locked while I'm looking for a Free
>> software
>> solution, preferably over GNU Radio and affordable SDR such as LimeSDR[2]
>> which is what I'm trying to master at the moment. Unfortunately, I
>> couldn't as
>> much as find a reference protocol, anything, really- to suggest how I
>> would
>> typically approach this- what bands, modes, encodings are used to
>> transmit
>> email over the radio.
>>
>> Are there any existing GNU Radio-operated email servers and/or
>> networks I could
>> use for reference and future collaboration? I'm heavily invested in
>> the idea of
>> hardening my email infrastructure in case of an emergency, and if
>> Internet goes
>> down in my country, I still wish that my server would remain operation
>> over the
>> radio.
>
> Curious what spectrum you plan to use for this, given that, as far as I
> was aware, you cannot use amateur radio for encrypted comms. Is there
> some HF spectrum readily available for such purposes?
>
> Regards,
>
> Andrew
>