Bonjour j'ai suivi à la lettre le tutoriel mais lorsque j'envoie un mail à mon compte gmail le message est refusé et on me renvoie ce message:

This is the mail system at host uy1.uy1intranet.cm.

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

<monemail@gmail.com>: host gmail-smtp-in.l.google.com[64.233.185.27] said:
    550-5.7.1 [154.72.167.22] The IP you're using to send mail is not
    authorized to 550-5.7.1 send email directly to our servers. Please use the
    SMTP relay at your 550-5.7.1 service provider instead. Learn more at 550
    5.7.1  https://support.google.com/mail/?p=NotAuthorizedError
    c1si8547746ybq.485 - gsmtp (in reply to end of DATA command)