me@mygitlab:/var$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 mygitlab.test.org ESMTP Postfix (Ubuntu)
ehlo localhost
250-mygitlab.test.org
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250 SMTPUTF8
mail from: root@localhost
250 2.1.0 Ok
rcpt to: me@localhost
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
Subject: hi
thi sis the body
.
250 2.0.0 Ok: queued as 07A3619E1023
quit
221 2.0.0 Bye
Connection closed by foreign host.
You have new mail in /var/mail/julee
me@mygitlab:/var$ mail
"/var/mail/me": 2 messages 1 new 1 unread
 U   1 root@localhost     Fri Sep  7 02:17  15/509   testing 123
>N   2 root@localhost     Fri Sep  7 02:35  12/426   hi
?