Undelivered Mail Returned to Sender （2024.03.16）
This is the mail system at host relay.mailchannels.net.
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
alt1.gmail-smtp-in.l.google.com[142.250.141.26] said: 421-4.7.0
[23.83.223.10 21] Gmail has detected that this message is 421-4.7.0
suspicious due to the nature of the content and/or the links within.
421-4.7.0 To best protect our users from spam, the message has been
blocked. 421-4.7.0 For more information, go to 421 4.7.0
https://support.google.com/mail/answer/188131
p17-20020a637411000000b005dc6cbf8440si3409662pgc.99 - gsmtp (in reply to
end of DATA command)
