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cat /etc/ssmtp/revaliases
# sSMTP aliases
# 
# Format:       local_account:outgoing_address:mailhub
#
# Example: root:your_login@your.domain:mailhub.your.domain[:port]
# where [:port] is an optional port number that defaults to 25.
 

cat /etc/ssmtp/revaliases
# sSMTP aliases
# 
# Format:       local_account:outgoing_address:mailhub
#
# Example: root:your_login@your.domain:mailhub.your.domain[:port]
# where [:port] is an optional port number that defaults to 25.

echo "test"|mail -s "test"  thierry.rouillon@laposte.net
 send-mail: Cannot open smtp.gmail.com:587
 

echo "test"|mail -vs "test"  thierry.rouillon@laposte.net
[<-] 220 smtp.gmail.com ESMTP z84sm4161170wmh.27 - gsmtp
[->] EHLO Thierry_bureau
[<-] 250 SMTPUTF8
[->] STARTTLS
[<-] 220 2.0.0 Ready to start TLS
send-mail: Cannot open smtp.gmail.com:587

ls  /usr/share/sendmail-cf/cf/
Build*          cs-solaris2.mc     generic-hpux10.cf  generic-mpeix.cf        generic-solaris.cf   huginn.cs.mc     mandrake.mc     sendmail-real-time.mc  ucbarpa.mc
chez.cs.mc      cs-sunos4.1.mc     generic-hpux10.mc  generic-mpeix.mc        generic-solaris.mc   knecht.mc        python.cs.mc    submit-build.cf        ucbvax.mc
clientproto.mc  cs-ultrix4.mc      generic-hpux9.cf   generic-nextstep3.3.cf  generic-sunos4.1.cf  mail.cs.mc       README          submit.cf              uucpproto.mc
cs-hpux10.mc    cyrusproto.mc      generic-hpux9.mc   generic-nextstep3.3.mc  generic-sunos4.1.mc  mail.eecs.mc     real-time.mc    submit.mc              vangogh.cs.mc
cs-hpux9.mc     generic-bsd4.4.cf  generic-linux.cf   generic-osf1.cf         generic-ultrix4.cf   mailspool.cs.mc  s2k-osf1.mc     submit.mc.mandriva
cs-osf1.mc      generic-bsd4.4.mc  generic-linux.mc   generic-osf1.mc         generic-ultrix4.mc   Makefile         s2k-ultrix4.mc  tcpproto.mc
 

echo "test"|mail -vs "test"  thierry.rouillon@laposte.net
thierry.rouillon@laposte.net... Connecting to [127.0.0.1] via relay...
thierry.rouillon@laposte.net... Deferred: Connection refused by [127.0.0.1]
 

systemctl start sendmail

 echo "test"|mail -vs "test"  thierry.rouillon@laposte.net
thierry.rouillon@laposte.net... Connecting to [127.0.0.1] via relay...
220 thierry.bureau ESMTP Sendmail 8.15.1/8.15.1; Sat, 6 May 2017 23:48:35 +0200
>>> EHLO thierry.bureau
250-thierry.bureau Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH LOGIN PLAIN
250-DELIVERBY
250 HELP
>>> MAIL From:<thierry@thierry.bureau> SIZE=224 AUTH=thierry@thierry.bureau
250 2.1.0 <thierry@thierry.bureau>... Sender ok
>>> RCPT To:<thierry.rouillon@laposte.net>
>>> DATA
250 2.1.5 <thierry.rouillon@laposte.net>... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 v46LmZLP018279 Message accepted for delivery
thierry.rouillon@laposte.net... Sent (v46LmZLP018279 Message accepted for delivery)
Closing connection to [127.0.0.1]
>>> QUIT
221 2.0.0 thierry.bureau closing connection

   ----- The following addresses had permanent fatal errors -----
<thierry.rouillon@laposte.net>
    (reason: 501 5.0.1 Emetteur invalide. Invalid Sender. LPN007_405)
 

mail -v  thierry.rouillon@laposte.net
Subject: test
je fais un test
.
EOT
thierry.rouillon@laposte.net... Connecting to [127.0.0.1] via relay...
220 thierry.bureau ESMTP Sendmail 8.15.1/8.15.1; Sat, 13 May 2017 17:38:14 +0200
>>> EHLO thierry.bureau
250-thierry.bureau Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH LOGIN PLAIN
250-DELIVERBY
250 HELP
>>> MAIL From:<thierry@thierry.bureau> SIZE=235 AUTH=thierry@thierry.bureau
250 2.1.0 <thierry@thierry.bureau>... Sender ok
>>> RCPT To:<thierry.rouillon@laposte.net>
>>> DATA
250 2.1.5 <thierry.rouillon@laposte.net>... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .                                                                                                                                                                          
250 2.0.0 v4DFcE5f005760 Message accepted for delivery                                                                                                                         
thierry.rouillon@laposte.net... Sent (v4DFcE5f005760 Message accepted for delivery)                                                                                            
Closing connection to [127.0.0.1]
>>> QUIT
221 2.0.0 thierry.bureau closing connection
Vous avez du nouveau courrier dans /var/spool/mail/thierry

From MAILER-DAEMON@localhost.localdomain  Sat May 13 17:38:39 2017
Return-Path: <MAILER-DAEMON@localhost.localdomain>
Received: from localhost (localhost)
        by thierry.bureau (8.15.1/8.15.1) id v4DFcd5f005762;
        Sat, 13 May 2017 17:38:39 +0200
Date: Sat, 13 May 2017 17:38:39 +0200
From: Mail Delivery Subsystem <MAILER-DAEMON@localhost.localdomain>
Message-Id: <201705131538.v4DFcd5f005762@thierry.bureau>
To: <thierry@thierry.bureau>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
        boundary="v4DFcd5f005762.1494689919/thierry.bureau"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
 
This is a MIME-encapsulated message
 
--v4DFcd5f005762.1494689919/thierry.bureau
 
The original message was received at Sat, 13 May 2017 17:38:14 +0200
from localhost [127.0.0.1]
 
   ----- The following addresses had permanent fatal errors -----
<thierry.rouillon@laposte.net>
    (reason: 501 5.0.1 Emetteur invalide. Invalid Sender. LPN007_405)