ross@mercury:~$ echo "Test" | sendmail -v wintermute115@gmail.com
wintermute115@gmail.com... Connecting to [127.0.0.1] via relay...
220 mercury.whatiread.fyi ESMTP Sendmail 8.14.9/8.14.9/Debian-4; Sun, 3 Jan 2016 10:01:49 -0500; (No UCE/UBE) logging access from: localhost(OK)-localhost [127.0.0.1]
>>> EHLO mercury.whatiread.fyi
250-mercury.whatiread.fyi Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-EXPN
250-VERB
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH DIGEST-MD5 CRAM-MD5
250-DELIVERBY
250 HELP
>>> VERB
250 2.0.0 Verbose mode
>>> MAIL From:<ross@mercury.whatiread.fyi> SIZE=5 AUTH=ross@mercury.whatiread.fyi
250 2.1.0 <ross@mercury.whatiread.fyi>... Sender ok
>>> RCPT To:<wintermute115@gmail.com>
>>> DATA
250 2.1.5 <wintermute115@gmail.com>... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .
421 4.3.0 collect: Cannot write ./dfu03F1nuZ009761 (bfcommit, uid=0, gid=0): No such file or directory
>>> QUIT