Class SmtpTransport

Send mail using SMTP protocol

Namespace: Cake\Mailer\Transport

Constants

AUTH_LOGIN
```
'LOGIN'
```
AUTH_PLAIN
```
'PLAIN'
```

Property Summary

$_config protected

array<string, mixed>

Runtime config
$_configInitialized protected

bool

Whether the config property has already been configured with defaults
$_content protected

array<string, string>

Content of email to return
$_defaultConfig protected

array<string, mixed>

Default config for this class
$_lastResponse protected

array

The response of the last sent SMTP command.
$_socket protected

Cake\Network\Socket|null

Socket to SMTP server
$authType protected

string|null

Detected authentication type.

Method Summary

__construct() public

Constructor
__destruct() public

Destructor
__wakeup() public

Unserialize handler.
_auth() protected

Send authentication
_authLogin() protected

Authenticate using AUTH LOGIN mechanism.
_authPlain() protected

Authenticate using AUTH PLAIN mechanism.
_bufferResponseLines() protected

Parses and stores the response lines in 'code' => 'message' format.
_configDelete() protected

Deletes a single config key.
_configRead() protected

Reads a config key.
_configWrite() protected

Writes a config key.
_connect() protected

Connect to SMTP Server
_disconnect() protected

Disconnect
_generateSocket() protected

Helper method to generate socket
_parseAuthType() protected

Parses the last response line and extract the preferred authentication type.
_prepareFromAddress() protected

Prepares the from email address.
_prepareFromCmd() protected

Prepares the MAIL FROM SMTP command.
_prepareMessage() protected

Prepares the message body.
_prepareRcptCmd() protected

Prepares the RCPT TO SMTP command.
_prepareRecipientAddresses() protected

Prepares the recipient email addresses.
_sendData() protected

Send Data
_sendRcpt() protected

Send emails
_smtpSend() protected

Protected method for sending data to SMTP connection
_socket() protected

Get socket instance.
checkRecipient() protected

Check that at least one destination header is set.
configShallow() public

Merge provided config with existing config. Unlike config() which does a recursive merge for nested keys, this method does a simple merge.
connect() public

Connect to the SMTP server.
connected() public

Check whether an open connection to the SMTP server is available.
disconnect() public

Disconnect from the SMTP server.
getConfig() public

Returns the config.
getConfigOrFail() public

Returns the config for this specific key.
getLastResponse() public

Returns the response of the last sent SMTP command.
send() public

Send mail
setConfig() public

Sets the config.

Method Detail

__construct() public

__construct(array<string, mixed> $config = [])

Constructor

Parameters

array<string, mixed> $config optional: Configuration options.

__destruct() public

__destruct()

Destructor

Tries to disconnect to ensure that the connection is being terminated properly before the socket gets closed.

__wakeup() public

__wakeup(): void

Unserialize handler.

Ensure that the socket property isn't reinitialized in a broken state.

Returns

void

_auth() protected

_auth(): void

Send authentication

Returns

void

Throws

Cake\Network\Exception\SocketException

_authLogin() protected

_authLogin(string $username, string $password): void

Authenticate using AUTH LOGIN mechanism.

Parameters

string $username: Username.
string $password: Password.

Returns

void

_authPlain() protected

_authPlain(string $username, string $password): string|null

Authenticate using AUTH PLAIN mechanism.

Parameters

string $username: Username.
string $password: Password.

Returns

string|null

_bufferResponseLines() protected

_bufferResponseLines(array<string> $responseLines): void

Parses and stores the response lines in 'code' => 'message' format.

Parameters

array<string> $responseLines: Response lines to parse.

Returns

void

_configDelete() protected

_configDelete(string $key): void

Deletes a single config key.

Parameters

string $key: Key to delete.

Returns

void

Throws

Cake\Core\Exception\CakeException
if attempting to clobber existing config

_configRead() protected

_configRead(string|null $key): mixed

Reads a config key.

Parameters

string|null $key: Key to read.

Returns

mixed

_configWrite() protected

_configWrite(array<string, mixed>|string $key, mixed $value, string|bool $merge = false): void

Writes a config key.

Parameters

array<string, mixed>|string $key: Key to write to.
mixed $value: Value to write.
string|bool $merge optional: True to merge recursively, 'shallow' for simple merge, false to overwrite, defaults to false.

Returns

void

Throws

Cake\Core\Exception\CakeException
if attempting to clobber existing config

_connect() protected

_connect(): void

Connect to SMTP Server

Returns

void

Throws

Cake\Network\Exception\SocketException

_disconnect() protected

_disconnect(): void

Disconnect

Returns

void

Throws

Cake\Network\Exception\SocketException

_generateSocket() protected

_generateSocket(): void

Helper method to generate socket

Returns

void

Throws

Cake\Network\Exception\SocketException

_parseAuthType() protected

_parseAuthType(): void

Parses the last response line and extract the preferred authentication type.

Returns

void

_prepareFromAddress() protected

_prepareFromAddress(Cake\Mailer\Message $message): array

Prepares the from email address.

Parameters

Cake\Mailer\Message $message: Message instance

Returns

array

_prepareFromCmd() protected

_prepareFromCmd(string $message): string

Prepares the MAIL FROM SMTP command.

Parameters

string $message: The email address to send with the command.

Returns

string

_prepareMessage() protected

_prepareMessage(Cake\Mailer\Message $message): string

Prepares the message body.

Parameters

Cake\Mailer\Message $message: Message instance

Returns

string

_prepareRcptCmd() protected

_prepareRcptCmd(string $message): string

Prepares the RCPT TO SMTP command.

Parameters

string $message: The email address to send with the command.

Returns

string

_prepareRecipientAddresses() protected

_prepareRecipientAddresses(Cake\Mailer\Message $message): array

Prepares the recipient email addresses.

Parameters

Cake\Mailer\Message $message: Message instance

Returns

array

_sendData() protected

_sendData(Cake\Mailer\Message $message): void

Send Data

Parameters

Cake\Mailer\Message $message: Message instance

Returns

void

Throws

Cake\Network\Exception\SocketException

_sendRcpt() protected

_sendRcpt(Cake\Mailer\Message $message): void

Send emails

Parameters

Cake\Mailer\Message $message: Message instance

Returns

void

Throws

Cake\Network\Exception\SocketException

_smtpSend() protected

_smtpSend(string|null $data, string|false $checkCode = '250'): string|null

Protected method for sending data to SMTP connection

Parameters

string|null $data: Data to be sent to SMTP server
string|false $checkCode optional: Code to check for in server response, false to skip

Returns

string|null

Throws

Cake\Network\Exception\SocketException

_socket() protected

_socket(): Cake\Network\Socket

Get socket instance.

Returns

Cake\Network\Socket

Throws

RuntimeException
If socket is not set.

checkRecipient() protected

checkRecipient(Cake\Mailer\Message $message): void

Check that at least one destination header is set.

Parameters

Cake\Mailer\Message $message: Message instance.

Returns

void

Throws

Cake\Core\Exception\CakeException
If at least one of to, cc or bcc is not specified.

configShallow() public

configShallow(array<string, mixed>|string $key, mixed|null $value = null): $this

Merge provided config with existing config. Unlike config() which does a recursive merge for nested keys, this method does a simple merge.

Setting a specific value:

$this->configShallow('key', $value);

Setting a nested value:

$this->configShallow('some.nested.key', $value);

Updating multiple config settings at the same time:

$this->configShallow(['one' => 'value', 'another' => 'value']);

Parameters

array<string, mixed>|string $key: The key to set, or a complete array of configs.
mixed|null $value optional: The value to set.

Returns

$this

connect() public

connect(): void

Connect to the SMTP server.

This method tries to connect only in case there is no open connection available already.

Returns

void

connected() public

connected(): bool

Check whether an open connection to the SMTP server is available.

Returns

bool

disconnect() public

disconnect(): void

Disconnect from the SMTP server.

This method tries to disconnect only in case there is an open connection available.

Returns

void

getConfig() public

getConfig(string|null $key = null, mixed $default = null): mixed

Returns the config.

Usage

Reading the whole config:

$this->getConfig();

Reading a specific value:

$this->getConfig('key');

Reading a nested value:

$this->getConfig('some.nested.key');

Reading with default value:

$this->getConfig('some-key', 'default-value');

Parameters

string|null $key optional: The key to get or null for the whole config.
mixed $default optional: The return value when the key does not exist.

Returns

mixed

getConfigOrFail() public

getConfigOrFail(string $key): mixed

Returns the config for this specific key.

The config value for this key must exist, it can never be null.

Parameters

string $key: The key to get.

Returns

mixed

Throws

InvalidArgumentException

getLastResponse() public

getLastResponse(): array

Returns the response of the last sent SMTP command.

A response consists of one or more lines containing a response code and an optional response message text:

[
    [
        'code' => '250',
        'message' => 'mail.example.com'
    ],
    [
        'code' => '250',
        'message' => 'PIPELINING'
    ],
    [
        'code' => '250',
        'message' => '8BITMIME'
    ],
    // etc...
]

Returns

array

send() public

send(Cake\Mailer\Message $message): array{headers: string, message: string}

Send mail

Parameters

Cake\Mailer\Message $message: Message instance

Returns

array{headers: string, message: string}

Throws

Cake\Network\Exception\SocketException

setConfig() public

setConfig(array<string, mixed>|string $key, mixed|null $value = null, bool $merge = true): $this

Sets the config.

Usage

Setting a specific value:

$this->setConfig('key', $value);

Setting a nested value:

$this->setConfig('some.nested.key', $value);

Updating multiple config settings at the same time:

$this->setConfig(['one' => 'value', 'another' => 'value']);

Parameters

array<string, mixed>|string $key: The key to set, or a complete array of configs.
mixed|null $value optional: The value to set.
bool $merge optional: Whether to recursively merge or overwrite existing config, defaults to true.

Returns

$this

Throws

Cake\Core\Exception\CakeException
When trying to set a key that is invalid.

Property Detail

`$_config` protected

Runtime config

Type

array<string, mixed>

`$_configInitialized` protected

Whether the config property has already been configured with defaults

Type

bool

`$_content` protected

Content of email to return

Type

array<string, string>

`$_defaultConfig` protected

Default config for this class

Type

array<string, mixed>

`$_lastResponse` protected

The response of the last sent SMTP command.

Type

array

`$_socket` protected

Socket to SMTP server

Type

Cake\Network\Socket|null

`$authType` protected

Detected authentication type.

Type

string|null

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https://api.cakephp.org/4.4/class-Cake.Mailer.Transport.SmtpTransport.html