[Finstdio] Warning: could not send message for past 4 hours

[Mail Delivery Subsystem]

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    **      THIS IS A WARNING MESSAGE ONLY      **
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The original message was received at Mon, 23 Jan 2023 06:09:51 +0300
from localhost [127.0.0.1]

   ----- Transcript of session follows -----
... while talking to mx-aol.mail.gm0.yahoodns.net.:
>>> MAIL From:<finstdio at polarhome.com> SIZE=16579
<<< 421 4.7.0 [TSS04] Messages from 195.19.96.161 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes
<carolfregoe at aol.com>... Deferred: 421 4.7.0 [TSS04] Messages from 195.19.96.161 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old
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An embedded message was scrubbed...
From: Service <finstdio at polarhome.com>
Subject: Track your shipment T112156
Date: Mon, 23 Jan 2023 06:09:51 +0000
Size: 16648
URL: <http://redhat.polarhome.com/pipermail/finstdio/attachments/20230123/3eb20113/attachment.mht>