Email was not delivered on time

[MuhammedSuhail]

We encountered a situation where we scheduled an email to be sent at 10 AM EST, but after scheduling it, the schedule tab showed as 'not run' and there was no tick marked for the smart campaign either. When we revisited the smart campaign after half an hour, we observed that the email had been sent at 10:24 EST.

Similarly, there was another instance where a team member scheduled the email again since the schedule tab had shown as not run.

Can anyone please let me know why does this happen?

[kaylaB22877]

Were you sending to a large list? I've noticed delays when sending to a large list. 

Also, have you tried using an email program vs. a smart campaign? In my experience, email programs seem to run on time more so that smart campaigns. Especially if you use the head start feature.