If you get an e-mail bounce, it is possible that the e-mail address of one of the recipients does not exist. Check if the recipient's e-mail address has been correctly filled in.
It could also be that you get an email bounce, because the recipient has an "Out of Office" notification. Contact the recipient to verify that they have set their "Out of Office".
Do you have any questions about this e-mail bounce? Please contact us. This can be done via support@validsign.eu of 085 303 36 76.