Supervision

Donc la solution est :
1. Configure Postfix main configuration

a.vi /etc/postfix/main.cf

b. Add these lines:

smtp_sasl_security_options = noanonymous
relayhost = [smtp.gmail.com]:587
smtp_use_tls = yes
smtp_tls_CAfile = /etc/postfix/cacert.pem
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl/passwd

c. Save and exit

2. Create /etc/postfix/sasl/passwd

a. Create a directory sasl under /etc/postfix and create a file passwd with contents below:

[smtp.gmail.com]:587 username@gmail.com:password

Save and exit

b. Change permission
#chmod 600 /etc/postfix/sasl/passwd

c. Create lookup table via postmap
#postmap /etc/postfix/sasl/passwd

Issuing that command will create passwd.db

3. Generate your own CA certificate

a. Change directory to /etc/pki/tls/certs

#cd /etc/pki/tls/certs

b.Create a key and test certificate in one file

#make hostname.pem

You will something like

[root@FLT certs]# make hostname.pem
umask 77 ; \
PEM1='/bin/mktemp /tmp/openssl.XXXXXX' ; \
PEM2='/bin/mktemp /tmp/openssl.XXXXXX' ; \
/usr/bin/openssl req -utf8 -newkey rsa:1024 -keyout $PEM1 -nodes -x509 -days 365 -out $PEM2 -set_serial 0 ; \
cat $PEM1 > hostname.pem ; \
echo "" >> hostname.pem ; \
cat $PEM2 >> hostname.pem ; \
rm -f $PEM1 $PEM2
Generating a 1024 bit RSA private key
............................++++++
.....++++++
writing new private key to `/tmp/openssl.z12084?
---
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter `.', the field will be left blank.
---
Country Name (2 letter code) [GB]:
State or Province Name (full name) [Berkshire]:
Locality Name (eg, city) [Newbury]:
Organization Name (eg, company) [My Company Ltd]:
Organizational Unit Name (eg, section) []:
Common Name (eg, your name or your server's hostname) []:
Email Address []:

c. Fill-up the necessary information and copy the file on /etc/postfix as cacert.pem

#cp /etc/pki/tls/certs/hostname.pem /etc/postfix/cacert.pem

4. Restart the postfix service

#service postfix restart

NB : "POUR le test mettez :"

echo "Test mail from postfix" | mail -s "Test Postfix" you@example.com

Le mieux ce serait que tu suives un tutoriel et que tu nous dises où tu bloques :
https://rtcamp.com/tutorials/linux/ubuntu-postfix-gmail-smtp/

Note : si à la première instruction ton shell te dit "bash: aptitude: commant not found" lance au préalable :

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install aptitude

Bonne chance

Merci "mamiemando" ca marche bien j'arrive a recevoir des mails de mon postfix ! maintenant j'essayerais de programmer nagios pour avoir les notifs ! et si tu sais comment faire pour avoir des notifications par SMS ?

Pas la moindre idée, je n'ai jamais configuré ni utilisé postfix.

Je te propose de regarder un peu ce que tu trouves sur google. Si tu bloques, ouvre un nouveau fil de discussion puisque le problème initial semble résolu.

Bonne chance

EDIT : la suite ici : https://forums.commentcamarche.net/forum/affich-28107220-supervision-notification-sms#p28107220