why LogWatch send me a mail

[Roberto Felloni]

Hi to all.

Sorry if I ask stupid thing...
I'm newer of Linux; I'm windows user and to understand linux behaviour
is for me too hard.

At any boot, LogWatch send me a mail with some information than I
don't understand:
 --------------------- sendmail Begin ------------------------ 
**Unmatched Entries**
   STARTTLS=server: file /etc/mail/certs/cert.pem unsafe: No such file
or directory: 1 Time(s)
 ---------------------- sendmail End ------------------------- 
 --------------------- SSHD Begin ------------------------ 
SSHD Started: 1 Time(s)
Failed to bind:
   0.0.0.0 port 22 (Address already in use) : 1 Time(s)
 ---------------------- SSHD End ------------------------- 
------------------ Disk Space --------------------
Filesystem            Size  Used Avail Use% Mounted on
/dev/hdc2             878M  156M  678M  19% /
/dev/hda1              76M  5.9M   67M   9% /boot
/dev/hda2             8.6G  113M  8.1G   2% /home
none                  126M     0  126M   0% /dev/shm
/dev/hda3             3.9G  2.6G  1.1G  71% /usr
/dev/hdd1             2.0G  152M  1.8G   8% /var


Someone understand what's mean ?
Someone can give a right way to decode this message and for to
understand log files ?

Best regard and thank's in advantage
roberto