email

type Client interface {
	Attach(r io.Reader, filename string, c string) (a *email.Attachment, err error)
	SendWithStartTLS(addr string, a smtp.Auth, t *tls.Config) error
}

type Email struct {
	From        string
	To          []string
	Subject     string
	HTML        []byte
	Attachments []*email.Attachment
}

type Helper struct {
	Client
	Options
}

type Option func(*Options)

type Options struct {
	Email
	Sender
	Retry
}

type Retry struct {
	Count       int
	WaitTime    time.Duration
	MaxWaitTime time.Duration
}

type Sender struct {
	Host     string
	Port     string
	Username string
	Password string
}