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vBulletin has a mail queue that prevents bottlenecks when sending large numbers of emails (for example, when a new post is added to a thread that has a lot of subscriptions to it). By default, 10 emails are sent from the queue at a time. If you have a more powerful server, you can probably safely increase this number, but we do not recommend going too high on this regardless.
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vBulletin uses the mail server on the server running the forum. So in this case it is the mail server on forums.dv247.com
If we assume that the mail server on forums.dv247.com is ok then perhaps the vBulletin mail queue needs to be decreased? I am suspecting that perhaps vBulletin is waiting until there are 10 messages in the queue before sending that batch of messages.
Something for the moderator admin guys to play around with perhaps?