Getting the following mail - possibly due to some saved calender event

Due to the cron for  /usr/bin/horde-alarms

getting the following mail to root..

Can anyone tell the reason and under what circumstances it can happen  
(any mistake in configuration?).  Why default domain doesn't get added?

Using HGWE 5.2.20

Regards,
ANANT.


[ ERROR! ] Error with alarm
            "[email protected]"
[ ERROR! ] exception 'Horde_Mail_Exception' with message 'Address is missing
            domain.' in /usr/share/pear/Horde/Mail/Rfc822.php:423
            Stack trace:
            #0 /usr/share/pear/Horde/Mail/Rfc822.php(366):
            Horde_Mail_Rfc822->_parseAddrSpec()
            #1 /usr/share/pear/Horde/Mail/Rfc822.php(296):
            Horde_Mail_Rfc822->_parseMailbox()
            #2 /usr/share/pear/Horde/Mail/Rfc822.php(262):
            Horde_Mail_Rfc822->_parseAddress()
            #3 /usr/share/pear/Horde/Mail/Rfc822.php(182):
            Horde_Mail_Rfc822->_parseAddressList()
            #4 /usr/share/pear/Horde/Mail/Transport.php(194):
            Horde_Mail_Rfc822->parseAddressList('rangan', Array)
            #5 /usr/share/pear/Horde/Mail/Transport/Sendmail.php(91):
            Horde_Mail_Transport->parseRecipients('rangan')
            #6 /usr/share/pear/Horde/Mime/Part.php(1627):
            Horde_Mail_Transport_Sendmail->send('rangan', Array, Resource id
            #6955)
            #7 /usr/share/pear/Horde/Mime/Mail.php(479):
            Horde_Mime_Part->send('rangan', Object(Horde_Mime_Headers),
            Object(Horde_Mail_Transport_Sendmail))
            #8 /usr/share/pear/Horde/Alarm/Handler/Mail.php(107):
            Horde_Mime_Mail->send(Object(Horde_Mail_Transport_Sendmail))
            #9 /usr/share/pear/Horde/Alarm.php(449):
            Horde_Alarm_Handler_Mail->notify(Array)
            #10 /usr/bin/horde-alarms(26): Horde_Alarm->notify(NULL, true,
            false, Array)
            #11 {main}

            Next exception 'Horde_Mime_Exception' with message 'Address is
            missing domain.' in /usr/share/pear/Horde/Mime/Part.php:1642
            Stack trace:
            #0 /usr/share/pear/Horde/Mime/Mail.php(479):
            Horde_Mime_Part->send('rangan', Object(Horde_Mime_Headers),
            Object(Horde_Mail_Transport_Sendmail))
            #1 /usr/share/pear/Horde/Alarm/Handler/Mail.php(107):
            Horde_Mime_Mail->send(Object(Horde_Mail_Transport_Sendmail))
            #2 /usr/share/pear/Horde/Alarm.php(449):
            Horde_Alarm_Handler_Mail->notify(Array)
            #3 /usr/bin/horde-alarms(26): Horde_Alarm->notify(NULL,  
true, false,
            Array)
            #4 {main}

            Next exception 'Horde_Alarm_Exception' with message 'Address is
            missing domain.' in  
/usr/share/pear/Horde/Alarm/Handler/Mail.php:109
            Stack trace:
            #0 /usr/share/pear/Horde/Alarm.php(449):
            Horde_Alarm_Handler_Mail->notify(Array)
            #1 /usr/bin/horde-alarms(26): Horde_Alarm->notify(NULL,  
true, false,
            Array)
            #2 {main}


-- 
      सादर धन्यवाद/ Thanks & Regards
           अनंत / Anant
------------------------------------------------------------------------------
IMPORTANT NOTE:

ISRO Satellite Centre (ISAC) was renamed as U R Rao Satellite Centre (URSC).
Hence, the existing domain (isac.gov.in) is changed to new domain ursc.gov.in
resulting into change of e-mail address from [email protected] to  
[email protected].
Please note this change and update your contact details for new domain  
(ursc.gov.in).
------------------------------------------------------------------------------
Confidentiality Notice: This e-mail message, including any attachments, is for
the sole use of the intended recipient(s) and may contain confidential and
privileged information. Any unauthorized review, use, disclosure or
distribution is prohibited. If you are not the intended recipient, please
contact the sender by reply e-mail and destroy all copies of the original
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