SMTP

SMTP mail transport implementation for sending email via an SMTP server.

class SMTP extends \Hazaar\Mail\Transport\Transport

Handles connection, authentication, TLS negotiation, and message delivery using SMTP protocol. Supports DSN, multiple authentication methods, and header encoding.

Properties

server

The SMTP server hostname or IP address.

private string $server

port

The port number to connect to on the SMTP server.

private int $port

socket

The socket resource used for the SMTP connection.

private mixed $socket

readTimeout

Timeout in seconds for reading from the SMTP server.

private int $readTimeout

Methods

init

Initializes the SMTP transport with server, port, and timeout settings.

public init(array $settings): bool

Merges provided settings with defaults, validates required parameters, and sets up connection properties for SMTP communication.

Parameters

Parameter	Type	Description
$settings	array	SMTP configuration options. Must include 'server'.

send

Sends an email message using the SMTP protocol.

public send(TransportMessage $message): mixed

Handles connection, authentication, TLS negotiation, DSN, and message delivery. Throws exceptions on protocol or server errors.

Parameters

Parameter	Type	Description
$message	TransportMessage	the message to send via SMTP transport

connect

Establishes a socket connection to the SMTP server.

private connect(): bool

Opens a stream socket to the configured server and port, with the specified timeout. Throws an exception if connection fails.

close

Closes the SMTP socket connection.

private close(): bool

Safely closes the socket resource and resets the property. Returns true if closed, false if not connected.

write

Writes a message to the SMTP socket.

private write(string $msg): int

Sends a command or data to the SMTP server over the open socket connection.

Parameters

Parameter	Type	Description
$msg	string	the message to send to the server

read

Reads a response from the SMTP server and checks for expected status code.

private read(int $code, int $len = 1024, ?string $message, string $response): bool

Waits for a response, reads data from the socket, and validates the SMTP status code. Throws on timeout or unexpected code.

Parameters

Parameter	Type	Description
$code	int	expected SMTP status code
$len	int	maximum length of response to read
$message	string	output parameter for the response message
$response	string

getMessageCode

Extracts the SMTP status code from a response buffer.

private getMessageCode(string $buf, ?string $message): int

Parses the response string and returns the status code as integer. Sets the message output parameter.

Parameters

Parameter	Type	Description
$buf	string	the response buffer from the server
$message	string	output parameter for the response message

encodeEmail

Encodes an email address for use in SMTP commands.

private encodeEmail(array $email): string

Formats the email address and name for SMTP headers and commands.

Parameters

Parameter	Type	Description
$email	array	array with 'email' and optional 'name' keys

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