[Elecraft] HELP!!! Getting “Undelivered Mail Returned to Sender”

[Lou Laderman]

I can send emails to the list via qth.net direct, but I  get an error when I post here. Never had this issue before, and I don’t know what to do. I’ve been a subscriber, and have posted on here, for many years.

“The mail system 
<elecraft at mailman.qth.net>: host mx.spamexperts.com[38.111.198.185] said: 550 
   162.253.133.85 is not allowed to send mail from earthlink.net. Please see 
   the SPF record, with scope mfrom, identity lladerman at earthlink.net, and ip 
   162.253.133.85 (in reply to end of DATA command) “

Maybe someone with technical knowledge can interpret what’s going on and assist, this is waaaaay over my head

Lou, W0FK 

Begin forwarded message:

From: Mail Delivery System <MAILER-DAEMON at n2.nabble.com>
Date: May 15, 2020 at 6:57:21 PM CDT
To: lladerman at earthlink.net
Subject: Undelivered Mail Returned to Sender

This is the mail system at host n2.nabble.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

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