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NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | COLOPHON |
SMTP(1) BSD General Commands Manual SMTP(1)
smtp — Simple Mail Transfer Protocol client
smtp [-Chnv] [-F from] [-H helo] [-s server] [recipient ...]
The smtp utility is a Simple Mail Transfer Protocol (SMTP) client which
can be used to run an SMTP transaction against an SMTP server.
By default, smtp reads the mail content from the standard input, estab‐
lishes an SMTP session, and runs an SMTP transaction for all the speci‐
fied recipients. The content is sent unaltered as mail data.
The options are as follows:
-C Do not require server certificate to be valid.
-F from
Set the return-path (MAIL FROM) for the SMTP transaction.
Default to the current username.
-H helo
Define the hostname to advertise (HELO) when establishing the
SMTP session.
-h Display version and usage.
-n Do not actually execute a transaction, just try to establish an
SMTP session and quit. When this option is given, no message
is read from the standard input.
-s server
Specify the server to connect to and connection parameters.
The format is [proto://[user:pass@]]host[:port]. The following
protocols are available:
smtp Normal SMTP session with opportunistic STARTTLS.
smtp+tls Normal SMTP session with mandatory STARTTLS.
smtp+notls Plain text SMTP session without TLS.
lmtp LMTP session with opportunistic STARTTLS.
lmtp+tls LMTP session with mandatory STARTTLS.
lmtp+notls Plain text LMTP session without TLS.
smtps SMTP session with forced TLS on connection.
Defaults to “smtp://localhost:25”.
-v Be more verbose. This option can be specified multiple times.
smtpd(8)
The smtp program first appeared in OpenBSD 6.4.
This page is part of the OpenSMTPD (a FREE implementation of the
server-side SMTP protocol) project. Information about the project can
be found at https://www.opensmtpd.org/. If you have a bug report for
this manual page, see ⟨https://github.com/OpenSMTPD/OpenSMTPD/issues⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/OpenSMTPD/OpenSMTPD.git⟩ on 2020-08-13. (At that
time, the date of the most recent commit that was found in the reposi‐
tory was 2020-07-27.) If you discover any rendering problems in this
HTML version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or improvements to
the information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
BSD July 4, 2018 BSD