Bonjour
Depuis 3 mois je me débats avec un problème d'envoi de mail vers des adresses gmail qui n'arrivent jamais quand ils sont envoyés depuis thunderbird (que se soit depuis une adresse free ou online)
Par contre aucun problème quand je fais l'envoie directement depuis mes interfaces "webmail " (online/scaleway ou free)... 
Quelqu'un peut -il m'aider? 
Merci d'avance.
Bonne soirée.
Sarah
Ci dessous le Message retour:
"Undelivered mail returned to sender:
This is the mail system at host nc-smtp2.sdv.fr.
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.
Code : Tout sélectionner
The mail systemsarah.marchand75@gmail.com: host gmail-smtp-in.l.google.com[74.125.133.26]
said: 550-5.7.26 This mail is unauthenticated, which poses a security risk
to the 550-5.7.26 sender and Gmail users, and has been blocked. The sender
must 550-5.7.26 authenticate with at least one of SPF or DKIM. For this
message, 550-5.7.26 DKIM checks did not pass and SPF check for [free.fr]
did not pass 550-5.7.26 with ip: [212.95.69.92]. The sender should visit
550-5.7.26 https://support.google.com/mail/answer/ ... entication for
550 5.7.26 instructions on setting up authentication.
a17-20020adff7d1000000b003111059b133si1270753wrq.1045 - gsmtp (in reply to
end of DATA command)
Reporting-MTA: dns; nc-smtp2.sdv.fr
X-Postfix-Queue-ID: 14BBCA00D1
X-Postfix-Sender: rfc822; sarah.walton@free.fr
Arrival-Date: Tue, 18 Jul 2023 19:37:47 +0200 (CEST)
Final-Recipient: rfc822; sarah.marchand75@gmail.com
Original-Recipient: rfc822;sarah.marchand75@gmail.com
Action: failed
Status: 5.7.26
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.26 This mail is unauthenticated, which poses a
security risk to the 550-5.7.26 sender and Gmail users, and has been
blocked. The sender must 550-5.7.26 authenticate with at least one of SPF
or DKIM. For this message, 550-5.7.26 DKIM checks did not pass and SPF
check for [free.fr] did not pass 550-5.7.26 with ip: [212.95.69.92]. The
sender should visit 550-5.7.26
https://support.google.com/mail/answer/ ... entication for 550 5.7.26
instructions on setting up authentication.
a17-20020adff7d1000000b003111059b133si1270753wrq.1045 - gsmtp"
