I am not using OAuth to send campaing email I am using an email adress on an other domain with baisic auth. when sending test emails it works fine both on personal using OAuth and group using Basic Auth
So, I manually purged the email queues and restarted a campain from scratch and it worked fine.
not sure what happend there??
thank you all for your insights
Glad that it worked for you!
If you find out what was the issue, please post here.