Oh, responding to your email, I got this bounce:

    This is the mail system at host adjuvant.canonical.org.

    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

    <(your email address)>: host mx01.mail.icloud.com[17.42.251.62] said: 554
        5.7.1 [HM08] Message rejected due to local policy. Please visit
        https://support.apple.com/en-us/HT204137 (in reply to end of DATA command)

I removed your email address in case it gets harvested by spambots.