Can't post question to nabble in subscribed page

[farhad.jabiyev]

Can't post question to nabble in subscribed page (http://apache-ignite-users.70518.x6.nabble.com/)

I am posting message, but then receiev such email: "Undelivered Mail Returned to Sender"

[GregChapman]

Be aware that that forum is just an archive of messages posted to a mail list.
If you wish to post to the list via the archive then you will need to subscribe to the mail list itself.
To do this you send an email to: [e-mail]

[farhad.jabiyev]

I already did it. Now, I did it for the second time and receive email that "You have already subscribed"

[GregChapman]

In which case, I think we need to see more of the message that said  "Undelivered Mail Returned to Sender" to see what further information it provides about the reason for non-delivery and whether it comes from Nabble or the mail list itself.

[farhad.jabiyev]

HEre is the content of e-mail:

This is the mail system at host n6.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

<[e-mail]>: host mx1-he-de.apache.org[116.203.90.47] said: 550
    5.7.23 <[e-mail]>: Recipient address rejected: Message
    rejected due to: Receiver policy for SPF Softfail.
    https://cwiki.apache.org/confluence/display/INFRA/ASF+Mail+Rejection+Policy
    (in reply to RCPT TO command)



---------- Forwarded message ----------
From: farhad_jabiyev <[e-mail]>
To: [e-mail]
Cc:
Bcc:
Date: Fri, 13 Sep 2019 07:03:19 -0700 (MST)
Subject: demo
demo demo



--
Sent from: http://apache-ignite-users.70518.x6.nabble.com/

[GregChapman]

I think the clue is in this:
Message rejected due to: Receiver policy for SPF Softfail.

I had to Google "SPF Softfail", but it looks as if the Apache mail lists have introduced new security measures and they prevent the Nabble approach of spoofing a subscribers address when forwarding a post made on the archive to the mail list.

I'm guessing that the topic:
http://support.nabble.com/Tomcat-user-group-tp7604231.html
relates to the same issue.

If this is true, it means that no one will be able to post on a mail list archive that adopts that measure, and they will only be useful as historic records of mail list posts. :-(

Hopefully, someone from Nabble will be able to confirm this diagnosis.