6 SMTP: Sending E-Mail

▼ |  | Net: Racket Networking Libraries

1 | URLs and HTTP
2 | URI Codec: Encoding and Decoding URIs
3 | Web Socket
4 | FTP: Client Downloading
5 | Send URL: Opening a Web Browser
6 | SMTP: Sending E-Mail
7 | sendmail: Sending E-Mail
8 | Headers: Parsing and Constructing
9 | IMAP: Reading Mail
10 | POP3: Reading Mail
11 | MIME: Decoding Internet Data
12 | Base 64: Encoding and Decoding
13 | Quoted-Printable: Encoding and Decoding
14 | DNS: Domain Name Service Queries
15 | NNTP: Newsgroup Protocol
16 | TCP: Unit and Signature
17 | TCP Redirect: tcp^ via Channels
18 | SSL Unit: tcp^ via SSL
19 | CGI Scripts
20 | Cookie: HTTP Client Storage
| Bibliography
| Index

► | 6 | SMTP: Sending E-Mail

6.1 | SMTP Functions
6.2 | SMTP Unit
6.3 | SMTP Signature

On this page:

6.1`` SMTP Functions
smtp-send-message
smtp-sending-end-of-message
6.2`` SMTP Unit
smtp@
6.3`` SMTP Signature
smtp^

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### 6`` SMTP: Sending E-Mail

( require net/smtp)

The net/smtp module provides tools for sending electronic mail messages using SMTP. The client must provide the address of an SMTP server; in contrast, the net/sendmail module uses a pre-configured sendmail on the local system.

The net/head library defines the format of a header string, which is used by send-smtp-message. The net/head module also provides utilities to verify the formatting of a mail address. The procedures of the net/smtp module assume that the given string arguments are well-formed.

#### 6.1`` SMTP Functions

( smtp-send-message |  | server-address |  |  |  |
|  | from |  |  |  |
|  | to |  |  |  |
|  | header |  |  |  |
|  | message |  |  |  |
| [ | #:port-no port-no/k |  |  |  |
|  | #:auth-user user |  |  |  |
|  | #:auth-passwd pw |  |  |  |
|  | #:tcp-connect connect |  |  |  |
|  | #:tls-encode encode |  |  |  |
|  | port-no]) |  | → |  | void?

server-address : string?
from : string?
to : ( listof string?)
header : string?
message : ( listof ( or/c string? bytes?))
port-no/k : ( integer-in 0 65535) = 25
user : ( or/c string? false/c) = #f
pw : ( or/c string? false/c) = #f

connect

:

(( string? ( integer-in 0 65535))
. ->* . ( input-port? output-port?))

=

tcp-connect

encode

:

( or/c false/c
(( input-port? output-port?
#:mode ( one-of/c 'connect)
#:encrypt ( one-of/c 'tls)
#:close-original? ( one-of/c #t))
. ->* . ( input-port? output-port?)))

=

#f

port-no : ( integer-in 0 65535) = port-no/k

Connects to the server at server-address and port-no to send a message. The from argument specifies the mail address of the sender, and to is a list of recipient addresses (including “To:”, “CC”, and “BCC” recipients).

The header argument is the complete message header, which should already include “From:”, “To:”, and “CC:” fields consistent with the given sender and recipients. See also the net/head library for header-creating utilities.

The message argument is the body of the message, where each string or byte string in the list corresponds to a single line of message text. No string in message should contain a carriage return or linefeed character.

The optional port-no argument – which can be specified either with the #:port-no keyword or, for backward compatibility, as an extra argument after keywords – specifies the IP port to use in contacting the SMTP server.

The optional #:auth-user and #:auth-passwd keyword argument supply a username and password for authenticated SMTP (using the AUTH PLAIN protocol).

The optional #:tcp-connect keyword argument supplies a connection procedure to be used in place of tcp-connect. For example, use ssl-connect to connect to the server via SSL.

If the optional #:tls-encode keyword argument supplies a procedure instead of #f, then the ESMTP STARTTLS protocol is used to initiate SSL communication with the server. The procedure given as the #:tls-encode argument should be like ports->ssl-ports; it will be called as

(encode r w #:mode 'connect #:encrypt 'tls #:close-original? #t)

and it should return two values: an input port and an export port. All further SMTP communication uses the returned ports.

For encrypted communication, normally either ssl-connect should be supplied for #:tcp-connect, or ports->ssl-ports should be supplied for #:tls-encode – one or the other (depending on what the server expects), rather than both.

( smtp-sending-end-of-message) → (-> any)
( smtp-sending-end-of-message proc) → void?
proc : (-> any)

A parameter that determines a send-done procedure to be called after smtp-send-message has completely sent the message. Before the send-done procedure is called, breaking the thread that is executing smtp-send-message cancels the send. After the send-done procedure is called, breaking may or may not cancel the send (and probably will not).

#### 6.2`` SMTP Unit

( require net/smtp-unit)

smtp@ : unit?

Imports nothing, exports smtp^.

#### 6.3`` SMTP Signature

( require net/smtp-sig)

smtp^ : signature

Includes everything exported by the net/smtp module.

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