[kronolith] Possible problem with daily agendas: /usr/bin/php5 -f /usr/bin/kronolith-agenda (failed)

[gimili]

My daily agendas seem to have stopped.  Is anyone else having any trouble with them?  Thank you.
Kronolith 3.0.16

sendmail: fatal: Recipient addresses must be specified on the command line or via the -t option
postdrop: warning: stdin: unexpected EOF in data, record type 78 length 76
postdrop: fatal: uid=0: malformed input
exception 'Horde_Mail_Exception' with message 'sendmail: temporary failure (75)' in /usr/share/php/Horde/Mail/Transport/Sendmail.php:238
Stack trace:
#0 /usr/share/php/Horde/Mime/Part.php(1736): Horde_Mail_Transport_Sendmail->send('', Array, Resource id #374)
#1 /usr/share/php/Horde/Mime/Mail.php(497): Horde_Mime_Part->send('rita, rita@', Object(Horde_Mime_Headers), Object(Horde_Mail_Transport_Sendmail))
#2 /usr/bin/kronolith-agenda(175): Horde_Mime_Mail->send(Object(Horde_Mail_Transport_Sendmail))
#3 /usr/bin/kronolith-agenda(22): send_agendas()
#4 {main}

Next exception 'Horde_Mime_Exception' with message 'sendmail: temporary failure (75)' in /usr/share/php/Horde/Mime/Part.php:1738
Stack trace:
#0 /usr/share/php/Horde/Mime/Mail.php(497): Horde_Mime_Part->send('rita, rita@', Object(Horde_Mime_Headers), Object(Horde_Mail_Transport_Sendmail))
#1 /usr/bin/kronolith-agenda(175): Horde_Mime_Mail->send(Object(Horde_Mail_Transport_Sendmail))
#2 /usr/bin/kronolith-agenda(22): send_agendas()
#3 {main}Segmentation fault

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gimili