Alright, so:

Nabble[1] is trying to send mail from your Mindspring address to
mailman.qth.net.

Mindspring has an SPF record, which lists which servers are allowed to send
outgoing messages from mindspring.com. Generally this lists Mindspring's
email servers, and messages sent from anyone else are assumed to be spam.
This is good; it's a step towards preventing junk and forged email.

mailman.qth.net uses spamexperts for spam filtering[2], and spamexperts'
server is rejecting your message because Nabble's outgoing mail server
isn't one of Mingspring's allowed servers. This is good; Nabble could well
be a spammer, or someone could be using Nabble to forge messages from
Mindspring's customers.

The way to fix this is to email the list directly ([email protected])
from your Mindspring account, using their webmail or a client pointed at
their SMTP server.

[1] I found this by looking up the reverse DNS for 162.253.133.85, which is
n2.nabble.com.
[2] I found this by looking up the MX record for mailman.qth.net, which is
mx.spamexperts.com (plus a couple of fallback servers).

On Fri, Mar 12, 2021 at 8:45 PM Ned Mountain <[email protected]>
wrote:

> <[email protected]>: host mx.spamexperts.com[38.89.254.156] said:
> 550
>
>     162.253.133.85 is not allowed to send mail from mindspring.com. Please
> see
>
>     the SPF record, with scope mfrom, identity [email protected]
> ,
> and
>
>     ip 162.253.133.85 (in reply to end of DATA command)
>
>
>
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