[libreoffice-users] messages returned

Good afternoon
I am trying to post a message, or rather repons to another one, but my
messages are rejected.
Although I DID sent a message from this computer / mail address a few
days ago.
(I did not change anything here on my computer ...)

What is it, that I am making wrong this time?

Below the first part of a rather lengthy error message.

xxxxxxxxxxxxxxxxxx

Your mail could not be delivered due to the following error.

<users@global.libreoffice.org>: host bilbo.documentfoundation.org[178.63.91.70]
    said: 550 5.7.1 <users@global.libreoffice.org>: Recipient address rejected:
    Mail appears to be spam or forged and is rejected due to policy. Using
    cached results - retrying too fast. penalty: 30 seconds x 0 retries. (in
    reply to RCPT TO command)


Thank you.

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