interfaces

type Address = mail.Address

type Attachment struct {
	Name   string
	Inline bool
	Attach io.ReadCloser
}

type Message struct {
	From         *Address              //发件人
	ReplyTo      *Address              //回复地址
	Recipients   map[string][]*Address //收件地址
	Subject      string                //主题
	TextBody     string                //超文本内容
	HtmlBody     string                //文本内容
	Attachments  []*Attachment         //附件
	Priority     string                //优先级: normal, low, high
	DeliveryTime time.Time             //定时发送
	Tags         []string              //添加标签(某些第三方服务可用的功能)
	Tracking     bool                  //允许追踪(某些第三方服务可用的功能)
}

type Sender interface {
	Send(ctx context.Context, message *Message) (bizId string, err error)
}