An application by former Conservative Party leader Colin Craig to have Vodafone New Zealand release correspondence between former Conservative Party Board members has been rejected by a court.

Colin Craig made the application in March as part of an ongoing discovery process in one of a string of defamation cases.

In this particular case he's suing former Conservative Party board member John Stringer for defamation after the party fell to pieces during the Dirty Politics saga.

The judgment says Mr Craig made the application because he was concerned some correspondence that would be vital to the case would be held back by Mr Stringer.

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If he'd been successful, Vodafone would have had to release any emails sent to or from Mr Stringer's email accounts between November 1, 2014, and February 26, 2016.