All Email convert to Soft Bounce when i send a compain

[Sparky]

Hi guys,
I have a server on CENTOS 6.5 and VesraCP (Exim, devecot) with the last update of MailWizz
When i sent a campaign (21000 emails), all the emails was marked as Soft Bounce and Blacklisted in database.

When i send email individually from my roundcube with the same server and same email account, that i use in mailwizz, it work perfectely

do you have any idea about that problem
thanks

 

[VVT]

Go to Campaign overview, click on "view details" button on "Bounce rate" box. It should reveal the bounce reason. Alternatively, you can check under Miscellaneous > Campaigns bounce logs in the backend area to see why those emails were bounced.