Reply To: Background Topic Notifications question

[vinny]

But someone else logs in 30 seconds later and then it is sent?

Actually, WordPress fires off a wp-cron job that runs in parallel with the user’s hit, so as to not impact the load time of the page. So if you have a few hundred recipients, the notification process will continue to run in the background long after the visitor has loaded the page and even moved on to another one.

Not running it in the background only works for small lists, as the mailout may cause the page load to time out.

Cheers,
Vinny