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Let’s say we have a file named message.mail holding a fully composed email message:
Sender: marco@localhost From: marco@localhost To: root@localhost Subject: server on fire? I noticed flames raising from the server room... -- Marco
basically, to send it with sendmail-mbfl.sh we have to do:
$ sendmail-mbfl.sh \
--envelope-from=marco@localhost \
--envelope-to=root@localhost \
--message=message.mail
by default the SMTP server name is set to localhost and the TCP port to 25. The
default session is plain, without TLS.
Port number 25 is officially assigned to the SMTP protocol; if the localhost uses a
different TCP port, we can select it with the --port option:
$ sendmail-mbfl.sh --port=587 \
--envelope-from=marco@localhost \
--envelope-to=root@localhost \
--message=message.mail
To send mail to a remote SMTP server, we select its hostname with the --host option:
$ sendmail-mbfl.sh \
--host=smtp.gmail.com --port=587 \
--envelope-from=marco@gmail.com \
--envelope-to=marco@spiffy.it \
--message=message.mail
Mail services may offer encrypted sessions to their SMTP servers. Encryption with the TLS
protocol is supported by sendmail-mbfl.sh through external programs. Whether a server
requires an encrypted session, can be specified using the --plain, --tls or
--starttls options.
To establish an encrypted session, the script needs to acquire the credentials of the user. These can be stored in a configuration file named ~/.mbfl-authinfo, which looks like this:
machine smtp.gmail.com login marco@gmail.com password abcdefghilm machine relay.poste.it login marco@poste.it password 0123456789
so that a line/record can be uniquely identified with values of the --host and --username options.
So we can do:
$ sendmail-mbfl.sh --host=gmail \
--username=marco --starttls \
--envelope-from=marco@gmail.com \
--envelope-to=marco@spiffy.it \
--message=message.mail
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