XF 1.5 At least one mail header line is too long

[Dakis]

On threads with long titles I get this server error in the admincp, does this relate to xenforo itself or do I need to look at the bdmail addon (or even my Amazon SES) ?

Stack Trace
Zend_Mail_Exception: Email to ** failed: At least one mail header line is too long - library/Zend/Mail/Transport/Abstract.php:217 Generated By: Unknown Account, 10 λεπτά πριν
#0 /home/nginx/***/community/library/Zend/Mail/Transport/Abstract.php(337): Zend_Mail_Transport_Abstract->_prepareHeaders(Array) #1 /home/nginx/***community/library/Zend/Mail.php(1194): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail)) #2 /home/nginx/***/community/library/XenForo/Model/MailQueue.php(79): Zend_Mail->send(Object(bdMails_Transport_AmazonSes)) #3 /home/nginx/***/community/library/XenForo/Deferred/MailQueue.php(10): XenForo_Model_MailQueue->runMailQueue(8) #4 /home/nginx/***/community/library/XenForo/Model/Deferred.php(295): XenForo_Deferred_MailQueue->execute(Array, Array, 8, '') #5 /home/nginx/***/community/library/XenForo/Model/Deferred.php(429): XenForo_Model_Deferred->runDeferred(Array, 8, '', false) #6 /home/nginx/***/community/library/XenForo/Model/Deferred.php(374): XenForo_Model_Deferred->_runInternal(Array, 8, '', false) #7 /home/nginx/***/community/deferred.php(23): XenForo_Model_Deferred->run(false) #8 {main}