[horde] Horde6-beta: Error when sending mail

[Mike]

When sending mail to barjunk at attglobal.net I get this error.

Apr 18 08:45:33 ubuntu HORDE[6589]: [imp] ValueError: idn_to_ascii():  
Argument #1 ($domain) must not be empty in  
/var/www/horde6-beta/vendor/horde/idna/lib/Horde/Idna.php:49
Apr 18 08:45:33 ubuntu HORDE[6589]: Stack trace:
Apr 18 08:45:33 ubuntu HORDE[6589]: #0  
/var/www/horde6-beta/vendor/horde/idna/lib/Horde/Idna.php(49):  
idn_to_ascii()
Apr 18 08:45:33 ubuntu HORDE[6589]: #1  
/var/www/horde6-beta/vendor/horde/mail/lib/Horde/Mail/Rfc822/Address.php(141):  
Horde_Idna::encode()
Apr 18 08:45:33 ubuntu HORDE[6589]: #2  
/var/www/horde6-beta/vendor/horde/mail/lib/Horde/Mail/Rfc822/Address.php(168):  
Horde_Mail_Rfc822_Address->__get()
Apr 18 08:45:33 ubuntu HORDE[6589]: #3  
/var/www/horde6-beta/vendor/horde/mail/lib/Horde/Mail/Rfc822/Object.php(68):  
Horde_Mail_Rfc822_Address->_writeAddress()
Apr 18 08:45:33 ubuntu HORDE[6589]: #4  
/var/www/horde6-beta/vendor/horde/mail/lib/Horde/Mail/Rfc822/List.php(238):  
Horde_Mail_Rfc822_Object->writeAddress()
Apr 18 08:45:33 ubuntu HORDE[6589]: #5  
/var/www/horde6-beta/vendor/horde/mail/lib/Horde/Mail/Rfc822/Object.php(68):  
Horde_Mail_Rfc822_List->_writeAddress()
Apr 18 08:45:33 ubuntu HORDE[6589]: #6  
/var/www/horde6-beta/vendor/horde/mime/lib/Horde/Mime/Headers/Addresses.php(166):  
Horde_Mail_Rfc822_Object->writeAddress()
Apr 18 08:45:33 ubuntu HORDE[6589]: #7  
/var/www/horde6-beta/vendor/horde/mime/lib/Horde/Mime/Headers/Addresses.php(133):  
Horde_Mime_Headers_Addresses::doSendEncode()
Apr 18 08:45:33 ubuntu HORDE[6589]: #8  
/var/www/horde6-beta/vendor/horde/mime/lib/Horde/Mime/Headers/Element.php(99):  
Horde_Mime_Headers_Addresses->_sendEncode()
Apr 18 08:45:33 ubuntu HORDE[6589]: #9  
/var/www/horde6-beta/vendor/horde/mime/lib/Horde/Mime/Headers.php(139):  
Horde_Mime_Headers_Element->sendEncode()
Apr 18 08:45:33 ubuntu HORDE[6589]: #10  
/var/www/horde6-beta/vendor/horde/mime/lib/Horde/Mime/Part.php(1613):  
Horde_Mime_Headers->toArray()
Apr 18 08:45:33 ubuntu HORDE[6589]: #11  
/var/www/horde6-beta/vendor/horde/imp/lib/Compose.php(1391):  
Horde_Mime_Part->send()
Apr 18 08:45:33 ubuntu HORDE[6589]: #12  
/var/www/horde6-beta/vendor/horde/imp/lib/Compose.php(880):  
IMP_Compose->sendMessage()
Apr 18 08:45:33 ubuntu HORDE[6589]: #13  
/var/www/horde6-beta/vendor/horde/imp/lib/Ajax/Application/Handler/Common.php(538):  
IMP_Compose->buildAndSendMessage()
Apr 18 08:45:33 ubuntu HORDE[6589]: #14  
/var/www/horde6-beta/vendor/horde/core/lib/Horde/Core/Ajax/Application.php(177):  
IMP_Ajax_Application_Handler_Common->sendMessage()
Apr 18 08:45:33 ubuntu HORDE[6589]: #15  
/var/www/horde6-beta/vendor/horde/horde/services/ajax.php(64):  
Horde_Core_Ajax_Application->doAction()
Apr 18 08:45:33 ubuntu HORDE[6589]: #16  
/var/www/horde6-beta/web/horde/services/ajax.php(3): require_once('...')
Apr 18 08:45:33 ubuntu HORDE[6589]: #17 {main} [pid 6589 on line 78 of  
"/var/www/horde6-beta/vendor/horde/core/lib/Horde/ErrorHandler.php"]

Sending to this does work with horde alpha.

Using horde/imp 7beta3