campaigns not working


New Member
I am in a strange situation.
We have 1 default customer-created who was sending emails fine.
but then we create more customers and groups also assign then delivery servers in the group
but then campaign sending stop working
I deleted all customers and groups and now it's the same as before but still, it's not sending campaign all the campaign stuck from last 3 day
please help me

I checked cron they are fine
file permission is fine
sending quota is set as per daily limit but this issue is from the last 3 days so now I don't know what is the issue please help me