[Mailman-Users] Undelivered Mail Returned to Sender

[Jon Clements]

Sorry, but can anyone tell me how to stop this from happening? I receive
one of these in Spam every minute.

Mailman version 2.1.13 on Mac OSX.

Thanks.

Jon

*****
This is the mail system at host virtualorchard.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
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                   The mail system

<jmcextman at gmail.com>: host gmail-smtp-in.l.google.com[64.233.176.26] said:
    550-5.7.1 This message does not have authentication information or
fails to
    pass 550-5.7.1 authentication checks. To best protect our users from
spam,
    the 550-5.7.1 message has been blocked. Please visit 550-5.7.1
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.1 information. 62-v6si1797769ybw.621 - gsmtp (in reply to end of
DATA
    command)



---------- Forwarded message ----------
From: "龚致" <1975834224 at qq.com>
To: <apple-crop-owner at virtualorchard.com>
Cc:
Bcc:
Date: Sat, 04 Aug 2018 19:55:59 +0800
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-- 
Jon Clements
aka 'Mr Honeycrisp'
University of Massachusetts Amherst Extension
UMass Cold Spring Orchard
393 Sabin St.
Belchertown, MA  01007
413-478-7219 Verizon
413-378-3068 Project Fi
umassfruit.com