Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host mail1.tootai.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

<Two+unsubconfirm at rebilac.xyz>: host ASPMX.L.GOOGLE.COM[2a00:1450:400c:c00::1b]
    said: 550-5.7.1 [2a01:4f8:120:1104::70:14] Gmail has detected that this
    message does 550-5.7.1 not meet IPv6 sending guidelines regarding PTR
    records and 550-5.7.1 authentication. For more information, go to 550 5.7.1
    https://support.google.com/mail/?p=IPv6AuthError
    f5-20020adfe905000000b003392c340bb2si1880599wrm.511 - gsmtp (in reply to
    end of DATA command)
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From: pkg-voip-maintainers at lists.alioth.debian.org
Subject: Re: Unsubscribe request for gotwo [{EJj6060GsdntT_dnFIU0}]
Date: Sat, 27 Jan 2024 13:55:48 +0100
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URL: <http://alioth-lists.debian.net/pipermail/pkg-voip-maintainers/attachments/20240127/8cfe68c5/attachment-0001.eml>