running EmailProcessor.php causes Fatal Error and creates and empty contact record

Reproducible by running cronjob repeatedly. Each time EmailProcessor.php fails, a blank contact record (no email, no name, no address) gets created and the following error message shows in /var/www/sites/default/files/civicrm/templates_c/en_US/ConfigAndLog

Jan 15 05:34:18 [info] $Fatal Error Details = Array
(
[message] => No clue about the ezcMailDeliveryStatus
[code] =>
)

Jan 15 05:34:18 [info] $backTrace = /var/www/sites/all/modules/civicrm/CRM/Core/Error.php, backtrace, 303
/var/www/sites/all/modules/civicrm/CRM/Utils/Mail/Incoming.php, fatal, 76
/var/www/sites/all/modules/civicrm/CRM/Utils/Mail/Incoming.php, formatMailPart, 164
/var/www/sites/all/modules/civicrm/CRM/Utils/Mail/Incoming.php, formatMailMultipartReport, 98
/var/www/sites/all/modules/civicrm/CRM/Utils/Mail/Incoming.php, formatMailMultipart, 72
/var/www/sites/all/modules/civicrm/CRM/Utils/Mail/Incoming.php, formatMailPart, 250
/var/www/sites/all/modules/civicrm/bin/EmailProcessor.php, parseMailingObject, 211
/var/www/sites/all/modules/civicrm/bin/EmailProcessor.php, _process, 122
/var/www/sites/all/modules/civicrm/bin/EmailProcessor.php, process, 400