mail

package
v1.0.87 Latest Latest
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 Go to latest Published: Jun 19, 2024 License: MIT Imports: 16 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	TlsClient     = tls.Client
	SmtpNewClient = func(conn net.Conn, host string) (SmtpClient, error) {
		return smtp.NewClient(conn, host)
	}
)

Stubbed out for tests.

View Source 
var NetDialTimeout = net.DialTimeout

NetDialTimeout specifies the DialTimeout function to establish a connection to the SMTP server. This can be used to override dialing in the case that a proxy or other special behavior is needed.

Functions

func Addr added in v1.0.76 

func Addr(host string, port int) string

func Now added in v1.0.76 

func Now() time.Time

func Send 

func Send(s Sender, msg ...*Message) error

Send sends emails using the given Sender.

Types

type Dialer 

type Dialer struct {
	// Host represents the host of the SMTP server.
	Host string
	// Port represents the port of the SMTP server.
	Port int
	// Username is the username to use to authenticate to the SMTP server.
	Username string
	// Password is the password to use to authenticate to the SMTP server.
	Password string
	// Auth represents the authentication mechanism used to authenticate to the
	// SMTP server.
	Auth smtp.Auth
	// SSL defines whether an SSL connection is used. It should be false in
	// most cases since the authentication mechanism should use the STARTTLS
	// extension instead.
	SSL bool
	// TLSConfig represents the TLS configuration used for the TLS (when the
	// STARTTLS extension is used) or SSL connection.
	TLSConfig *tls.Config
	// StartTLSPolicy represents the TLS security level required to
	// communicate with the SMTP server.
	//
	// This defaults to OpportunisticStartTLS for backwards compatibility,
	// but we recommend MandatoryStartTLS for all modern SMTP servers.
	//
	// This option has no effect if SSL is set to true.
	StartTLSPolicy StartTLSPolicy
	// LocalName is the hostname sent to the SMTP server with the HELO command.
	// By default, "localhost" is sent.
	LocalName string
	// Timeout to use for read/write operations. Defaults to 10 seconds, can
	// be set to 0 to disable timeouts.
	Timeout time.Duration
	// Whether we should retry mailing if the connection returned an error,
	// defaults to true.
	RetryFailure bool
}

A Dialer is a dialer to an SMTP server.

func NewDialer 

func NewDialer(host string, port int, username, password string) *Dialer

NewDialer returns a new SMTP Dialer. The given parameters are used to connect to the SMTP server.

func NewPlainDialer deprecated 

func NewPlainDialer(host string, port int, username, password string) *Dialer

NewPlainDialer returns a new SMTP Dialer. The given parameters are used to connect to the SMTP server.

Deprecated: Use NewDialer instead.

func (*Dialer) Dial 

func (d *Dialer) Dial() (SendCloser, error)

Dial dials and authenticates to an SMTP server. The returned SendCloser should be closed when done using it.

func (*Dialer) DialAndSend 

func (d *Dialer) DialAndSend(m ...*Message) error

DialAndSend opens a connection to the SMTP server, sends the given emails and closes the connection.

type Encoding 

type Encoding string

Encoding represents a MIME encoding scheme like quoted-printable or base64. 

const (
	// QuotedPrintable represents the quoted-printable encoding as defined in
	// RFC 2045.
	QuotedPrintable Encoding = "quoted-printable"
	// Base64 represents the base64 encoding as defined in RFC 2045.
	Base64 Encoding = "base64"
	// Unencoded can be used to avoid encoding the body of an email. The headers
	// will still be encoded using quoted-printable encoding.
	Unencoded Encoding = "8bit"
)

type FileSetting 

type FileSetting func(*file)

A FileSetting can be used as an argument in Message.Attach or Message.Embed.

func Rename 

func Rename(name string) FileSetting

Rename is a file setting to set the name of the attachment if the name is different than the filename on disk.

func SetCopyFunc 

func SetCopyFunc(f func(io.Writer) error) FileSetting

SetCopyFunc is a file setting to replace the function that runs when the message is sent. It should copy the content of the file to the io.Writer.

The default copy function opens the file with the given filename, and copy its content to the io.Writer.

func SetHeader 

func SetHeader(h map[string][]string) FileSetting

SetHeader is a file setting to set the MIME header of the message part that contains the file content.

Mandatory headers are automatically added if they are not set when sending the email.

type LoginAuth added in v1.0.76 

type LoginAuth struct {
	Username string
	Password string
	Host     string
}

LoginAuth is an smtp.Auth that implements the LOGIN authentication mechanism.

func (*LoginAuth) Next added in v1.0.76 

func (a *LoginAuth) Next(fromServer []byte, more bool) ([]byte, error)

func (*LoginAuth) Start added in v1.0.76 

func (a *LoginAuth) Start(server *smtp.ServerInfo) (string, []byte, error)

type Message 

type Message struct {
	// contains filtered or unexported fields
}

Message represents an email.

func NewMessage 

func NewMessage(settings ...MessageSetting) *Message

NewMessage creates a new message. It uses UTF-8 and quoted-printable encoding by default.

func (*Message) AddAlternative 

func (m *Message) AddAlternative(contentType, body string, settings ...PartSetting)

AddAlternative adds an alternative part to the message.

It is commonly used to send HTML emails that default to the plain text version for backward compatibility. AddAlternative appends the new part to the end of the message. So the plain text part should be added before the HTML part. See http://en.wikipedia.org/wiki/MIME#Alternative

func (*Message) AddAlternativeWriter 

func (m *Message) AddAlternativeWriter(contentType string, f func(io.Writer) error, settings ...PartSetting)

AddAlternativeWriter adds an alternative part to the message. It can be useful with the text/template or html/template packages.

func (*Message) Attach 

func (m *Message) Attach(filename string, settings ...FileSetting)

Attach attaches the files to the email.

func (*Message) AttachReader 

func (m *Message) AttachReader(name string, r io.Reader, settings ...FileSetting)

AttachReader attaches a file using an io.Reader

func (*Message) Embed 

func (m *Message) Embed(filename string, settings ...FileSetting)

Embed embeds the images to the email.

func (*Message) EmbedReader 

func (m *Message) EmbedReader(name string, r io.Reader, settings ...FileSetting)

EmbedReader embeds the images to the email.

func (*Message) FormatAddress 

func (m *Message) FormatAddress(address, name string) string

FormatAddress formats an address and a name as a valid RFC 5322 address.

func (*Message) FormatDate 

func (m *Message) FormatDate(date time.Time) string

FormatDate formats a date as a valid RFC 5322 date.

func (*Message) GetHeader 

func (m *Message) GetHeader(field string) []string

GetHeader gets a header field.

func (*Message) Reset 

func (m *Message) Reset()

Reset resets the message so it can be reused. The message keeps its previous settings so it is in the same state that after a call to NewMessage.

func (*Message) SetAddressHeader 

func (m *Message) SetAddressHeader(field, address, name string)

SetAddressHeader sets an address to the given header field.

func (*Message) SetBody 

func (m *Message) SetBody(contentType, body string, settings ...PartSetting)

SetBody sets the body of the message. It replaces any content previously set by SetBody, SetBodyWriter, AddAlternative or AddAlternativeWriter.

func (*Message) SetBodyWriter 

func (m *Message) SetBodyWriter(contentType string, f func(io.Writer) error, settings ...PartSetting)

SetBodyWriter sets the body of the message. It can be useful with the text/template or html/template packages.

func (*Message) SetBoundary 

func (m *Message) SetBoundary(boundary string)

SetBoundary sets a custom multipart boundary.

func (*Message) SetDateHeader 

func (m *Message) SetDateHeader(field string, date time.Time)

SetDateHeader sets a date to the given header field.

func (*Message) SetHeader 

func (m *Message) SetHeader(field string, value ...string)

SetHeader sets a value to the given header field.

func (*Message) SetHeaders 

func (m *Message) SetHeaders(h map[string][]string)

SetHeaders sets the message headers.

func (*Message) WriteTo 

func (m *Message) WriteTo(w io.Writer) (int64, error)

WriteTo implements io.WriterTo. It dumps the whole message into w.

type MessageSetting 

type MessageSetting func(m *Message)

A MessageSetting can be used as an argument in NewMessage to configure an email.

func SetCharset 

func SetCharset(charset string) MessageSetting

SetCharset is a message setting to set the charset of the email.

func SetEncoding 

func SetEncoding(enc Encoding) MessageSetting

SetEncoding is a message setting to set the encoding of the email.

type PartSetting 

type PartSetting func(*part)

A PartSetting can be used as an argument in Message.SetBody, Message.SetBodyWriter, Message.AddAlternative or Message.AddAlternativeWriter to configure the part added to a message.

func SetPartEncoding 

func SetPartEncoding(e Encoding) PartSetting

SetPartEncoding sets the encoding of the part added to the message. By default, parts use the same encoding than the message.

type SendCloser 

type SendCloser interface {
	Sender
	Close() error
}

SendCloser is the interface that groups the Send and Close methods.

type SendError 

type SendError struct {
	// Index specifies the index of the Message within a batch.
	Index uint
	Cause error
}

A SendError represents the failure to transmit a Message, detailing the cause of the failure and index of the Message within a batch.

func (*SendError) Error 

func (err *SendError) Error() string

type SendFunc 

type SendFunc func(from string, to []string, msg io.WriterTo) error

A SendFunc is a function that sends emails to the given addresses.

The SendFunc type is an adapter to allow the use of ordinary functions as email senders. If f is a function with the appropriate signature, SendFunc(f) is a Sender object that calls f.

func (SendFunc) Send 

func (f SendFunc) Send(from string, to []string, msg io.WriterTo) error

Send calls f(from, to, msg).

type Sender 

type Sender interface {
	Send(from string, to []string, msg io.WriterTo) error
}

Sender is the interface that wraps the Send method.

Send sends an email to the given addresses.

type SmtpClient added in v1.0.76 

type SmtpClient interface {
	Hello(string) error
	Extension(string) (bool, string)
	StartTLS(*tls.Config) error
	Auth(smtp.Auth) error
	Mail(string) error
	Rcpt(string) error
	Data() (io.WriteCloser, error)
	Quit() error
	Close() error
}

type StartTLSPolicy 

type StartTLSPolicy int

StartTLSPolicy constants are valid values for Dialer.StartTLSPolicy. 

const (
	// OpportunisticStartTLS means that SMTP transactions are encrypted if
	// STARTTLS is supported by the SMTP server. Otherwise, messages are
	// sent in the clear. This is the default setting.
	OpportunisticStartTLS StartTLSPolicy = iota
	// MandatoryStartTLS means that SMTP transactions must be encrypted.
	// SMTP transactions are aborted unless STARTTLS is supported by the
	// SMTP server.
	MandatoryStartTLS
	// NoStartTLS means encryption is disabled and messages are sent in the
	// clear.
	NoStartTLS = -1
)

func (*StartTLSPolicy) String 

func (policy *StartTLSPolicy) String() string

type StartTLSUnsupportedError 

type StartTLSUnsupportedError struct {
	Policy StartTLSPolicy
}

StartTLSUnsupportedError is returned by Dial when connecting to an SMTP server that does not support STARTTLS.

func (StartTLSUnsupportedError) Error 

func (e StartTLSUnsupportedError) Error() string

Source Files

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