For some reason on one of my sites (all others work fine) the order updates are not going through. Customer is notified of order placement, contact us works, but not the order update emails (for example changing order status to "processing" with "Notify Customer" Email radio button checked.
Instead of a tick (customer notified), there is an open padlock.
Can anyone suggest what the possible reason might be for this? I've probably missed a setting somewhere but can't see it.
1.39g.
Thanks in advance.
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