Hi @supratim320 , It seems delivery is scheduled to deliver certain
percentage or number of emails every hour.Please check again the
delivery 'Properties'. Is it set waves? If not, is your delivery
accessing any Javascript which is doing this setup? If you are not able
to find anything, then try to use new/fresh delivery activity. Before
adding HTML content, check delivery properties, remove any additional
code written in the properties. Then do the HTML part and do the
testing. Thanks,Jyoti