[Plugin: BackWPup] mail job not working but log without errors

I have set a job to receive backup of my files in my mailbox.
The log does not show any error, but I do not receive the message. Other jobs work fine.

Here is the last log:

2010-11-20 07:53.00: Make a list of files to Backup ….
2010-11-20 07:53.00: Files to Backup: 729
2010-11-20 07:53.00: Size of all Files: 15 MB
2010-11-20 07:53.00: Create Backup Zip file…
2010-11-20 07:53.11: Backup Zip file create done!
2010-11-20 07:53.11: Prepare Sending backup file with mail…
2010-11-20 07:53.11: Send mail with PHP mail
2010-11-20 07:53.11: Creating mail
2010-11-20 07:53.11: Adding Attachment to mail
2010-11-20 07:53.11: Send mail….
2010-11-20 07:53.13: Mail send!!!
2010-11-20 07:53.13: Backup Archive File size is 9.02 MB
2010-11-20 07:53.13: Job done in 13 sec.

Mail send… but not received!!!