Hi @Vanditha_Pan, It can happen due to multiple reasons.This page on Delivery sending troubleshooting might help you with your problem. Cheers,Nikhil Kalladithodi

Hi AndMi,   Option 1 Yes we can create the workflows, campaigns, delivery  and other templates and can be resused. Please go to Navigation -> Resources -> Templates There you can see Workflow,Campaign, delivery  and other template options. Note: Please don't change the out-of-the-box  templates plea...