Hi there @anisulislam,
you need to close a loop. Considering Send Email node doesn’t have an output port you can’t use Loop End node but instead use Variable Loop End node 

Br,
Ivan
Hi there @anisulislam,
you need to close a loop. Considering Send Email node doesn’t have an output port you can’t use Loop End node but instead use Variable Loop End node 

Br,
Ivan