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NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | COLOPHON |
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SMTP(1) General Commands Manual SMTP(1)
smtp — Simple Mail Transfer Protocol client
smtp [-Chnv] [-a authfile] [-F from] [-H helo] [-s server] [-T
params] [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,
establishes an SMTP session, and runs an SMTP transaction for all
the specified recipients. The content is sent unaltered as mail
data.
The options are as follows:
-a authfile
Perform a login before sending the message. The username
and password are read from authfile and need to be on the
first and second line respectively. This option requires
a TLS or STARTTLS server.
-C Do not require server certificate to be valid. This flag
is deprecated. Use “-T noverify” instead.
-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 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”.
-T params
Set specific parameters for TLS sessions. The params
string is a comma or space separated list of options. The
available options are:
cafile=filename
Use filename as root certificates file instead of
the system default.
ciphers=value
Specify the allowed ciphers. Refer to
tls_config_set_ciphers(3) for value.
nosni Disable Server Name Indication (SNI).
noverify
Do not require server certificate to be valid.
protocols=value
Specify the protocols to use. Refer to
tls_config_parse_protocols(3) for value.
servername=value
Use value for Server Name Indication (SNI).
Defaults to the specified server hostname.
-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 2025-02-02. (At
that time, the date of the most recent commit that was found in
the repository was 2024-10-20.) 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
GNU May 23, 2021 SMTP(1)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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