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When enabled, subscription emails generated by your site will be processed in batches to lessen the load on your server. Account activation, lost passwords and other vital emails are sent instantly regardless of this setting. If your site has low traffic, subscription emails may be delayed.
If you have a large site, you may wish to enable locking. This prevents a rare situation where the same email is sent multiple times.
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Set To Yes with no Locking
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vBulletin includes a mail queuing system to prevent bottlenecks when sending lots of email. Use this option to specify how many emails will be sent per batch.
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Set to 10
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Set this option to yes to use an SMTP server rather than the internal PHP mail() function.
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NO
What do i need to do to get this to work right?