if a main action (like print email, save attachments, merge email and attachments in pdf,...) fails for any reason you can decide to stop here and
don't process the next action(s), or just do a rescue action like send an email...
Here the list of possible actions to do in case of failure:
Continue to the next action normaly: It is the default value
Continue to the next group of actions if one exists: It stop to process actions in current group and go directyl to next group
Stop here for this email: Don't process any actions for this email and go to the next email
Do this action: Choose an action to do like send an email, print to another printer,...