rfc

type Attachment struct {
	Filename string
	Content  []byte
	Header   textproto.MIMEHeader
}

type Clock interface {
	Now() time.Time
}

type ClockFunc func() time.Time

type Config struct {
	Clock     Clock
	MessageID MessageIDFactory
}

type Mail struct {
	Subject     string
	From        mail.Address
	To          []mail.Address
	CC          []mail.Address
	BCC         []mail.Address
	ReplyTo     []mail.Address
	Text        string
	HTML        string
	Attachments []Attachment
}

type MessageIDFactory interface {
	GenerateID(Mail) string
}

type MessageIDFunc func(Mail) string

type Option func(*Config)