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How Do I Fix Mail Send Stopping at 500 Sends?

2 Suggested cleaner tags (duplicate mail/email → civimail). Also suggest removing 'timeout' as you've stated it's not a timeout. :-)
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Mail Send Stopping at 500 Sends

When using Civi Mail, we have a recurring issue wherein the system stops sending emails at 500 sends. The job shows as incomplete.

It is not a php timeout, as the hosting company (https://www.rochen.com/) has increased all our limits during testing, with no change.

We can re-initiate the mail send, and it will send out the next set of 500 emails, then stop again. We have to continue manually triggering the send to get the full job completed.

Any thoughts on the culprit?

System info: CiviCRM 4.2.6 Joomla 2.5.28 php 5.3.29 MySQL 5.5.42-cli