apt install postfix mailutils

telnet localhost 25

HELO localhost
MAIL from: root@localhost
RCPT to: root@localhost
DATA
Subject: Hello
how are you
quit



mail


vi /etc/postfix/master.cf
vi /etc/postfix/main.cf

  inet_interfaces = all
  inet_protocols = ipv4
  myorigin = $mydomain
  #my_destination = $myhostname, localhost.$mydomain, localhost, $mydomain
  #my_networks = 
  #relayhost = $mydomain
 
  
  
apt install dovecot-imapd dovecot-pop3d mutt

   mail  -s "hola linda " linda
   mail  -s "otro correo " linda <.
   
   adduser linda mail
   
vi /etc/dovecot/dovecot.conf 
 
   listen = *, ::
   !include_try /usr/share/dovecot/protocols.d/*.protocol

cat /usr/share/dovecot/protocols.d/imapd.protocol

cat /usr/share/dovecot/protocols.d/pop3d.protocol



vi /etc/dovecot/conf.d/10-mail.conf
   
   mail_location = mbox:~/mail:INBOX=/var/mail/%u


mutt -f imap://linda@localhost

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