Empty notification popup due to invalid markup

OS: Ubuntu 10.10
Sbackup ver.. 0.11.3
Source: Official Ubuntu PPA
Use case:
My target place for backups is an usb device. It was switched off when daily cron started to make a fresh backup. Status was detected well and I was noticed about the situation. I canceled the service by clicking on the cancel button on the error window. Everything was Ok with that process but after it I have found an empty message(?) window on my desktop. I think it was an "email was sent succesfully" or something similar message. There was an error on e-mail sending (it might be the root problem, however my e-mail settings are tested successfully). 2 Screenshot provided.

Logs:
SBackup 'Default Profile' Logger

==============

2010-12-30 08:57:06,245 - INFO: Log output for [Default Profile] is directed to file '/var/log/sbackup/sbackup.2010-12-30_08.57.06.239267.log'.
2010-12-30 08:57:06,246 - INFO: Profile settings are being read from file '/etc/sbackup.conf'.
2010-12-30 08:57:06,262 - INFO: Preparation of backup process
2010-12-30 08:57:06,263 - INFO: Initializing GIO File Access Manager.
2010-12-30 08:57:06,436 - INFO: Backup destination: /media/Adatok/viko_UBUNTU_backups
2010-12-30 08:57:06,454 - WARNING: Unable to find destination directory.
2010-12-30 08:57:41,690 - WARNING: Backup was canceled by user.
2010-12-30 08:57:41,710 - INFO: Terminating GIO File Access Manager.
2010-12-30 08:57:41,711 - INFO: Processing of profile was canceled on user request
2010-12-30 08:57:43,163 - ERROR: Error when sending email: (550, '5.1.0 <email address hidden> sender rejected', 'SBackup Daemon <email address hidden>')

Cronlog:
----------
2010-12-30 08:57:06,245 - INFO: Log output for [Default Profile] is directed to file '/var/log/sbackup/sbackup.2010-12-30_08.57.06.239267.log'.
2010-12-30 08:57:06,246 - INFO: Profile settings are being read from file '/etc/sbackup.conf'.
2010-12-30 08:57:06,262 - INFO: Preparation of backup process
2010-12-30 08:57:06,263 - INFO: Initializing GIO File Access Manager.
2010-12-30 08:57:06,436 - INFO: Backup destination: /media/Adatok/viko_UBUNTU_backups
2010-12-30 08:57:06,454 - WARNING: Unable to find destination directory.
2010-12-30 08:57:41,690 - WARNING: Backup was canceled by user.
2010-12-30 08:57:41,710 - INFO: Terminating GIO File Access Manager.
2010-12-30 08:57:41,711 - INFO: Processing of profile was canceled on user request

2010-12-30 08:57:43,163 - ERROR: Error when sending email: (550, '5.1.0 <email address hidden> sender rejected', 'SBackup Daemon <email address hidden>')
Updating DISPLAY to: :0
Updating SSH_AUTH_SOCK to: /tmp/ssh-oUHVli1549/agent.1549
Updating GNOME_KEYRING_CONTROL to: /tmp/keyring-nohxae
Updating GNOME_KEYRING_PID to: 1530
Updating XAUTHORITY to: /var/run/gdm/auth-for-zu-dfjk4I/database
Updating GPG_AGENT_INFO to: None
D-Bus session bus launched
 DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-4hqO21Auh7,guid=72a1d6740ba1bd147eef630200000601
 DBUS_SESSION_BUS_PID=2264
Now launching indicator application (status icon).
Unable to get KDE Session Manager: org.freedesktop.DBus.Error.ServiceUnknown: The name org.kde.ksmserver was not provided by any .service files
Unable to get Gnome Session Manager: org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
No DE found using D-Bus. Looking for process id.
Indicator application started (PID: 2272)
/usr/share/sbackup/sbackup/ui/misc.py:215: GtkWarning: Failed to set text from markup due to error parsing markup: Error on line 3 char 32: '<email address hidden>' is not a valid name: '@'
  dialog.set_markup(_msg)
/usr/share/sbackup/sbackup/ui/indicator_core.py:703: GtkWarning: Failed to set text from markup due to error parsing markup: Error on line 3 char 32: '<email address hidden>' is not a valid name: '@'
  errmsg.run()
2010-12-30 09:02:17,168 - INFO: SBackupdDBusObject is being terminated.
Updating GPG_AGENT_INFO to: None
Indicator application was started as superuser (EUID=0).
Now dropping privileges (to user 'zu').
drop privileges: running as zu/zu
drop privileges: running as nobody/nogroup