[Finstdio] Warning: message 1pJnDe-005kcY-7b delayed 72 hours

[Mail Delivery System]

This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 72 hours on the queue on secg284.secrel.com.br.

The message identifier is:     1pJnDe-005kcY-7b
The date of the message is:    Mon, 23 Jan 2023 00:10:06 +0000
The subject of the message is: Lost package T75544727

The address to which the message has not yet been delivered is:

  lagadvaishali at yahoo.co.in
    host mx-apac.mail.gm0.yahoodns.net [106.10.248.73]
    Delay reason: SMTP error from remote mail server after pipelined MAIL FROM:<finstdio at polarhome.com> SIZE=18129:
    421 4.7.0 [TSS04] Messages from 200.150.137.161 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
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