Can you check whats the delay you have configured currently ?
This can be achieved via _Administration > System > Advance > Services >_ click <ins>Edit</ins> for the Mail Queue Service.
You may also try altering this.
I'm curious if you ever got a decent answer to this. Related issues seem to be:
I'm seeing similar behavior, and so far my hacky solution has been to automate the pressing of the mail queue flush button once a minute. But next I'm looking at the quartz scheduler, as the third URL suggests.
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