2016/06/07 10:27:03 534 5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbtq
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5.7.14  Learn more at
5.7.14  https://support.google.com/mail/answer/78754 89sm7243327qth.2 - gsmtp

type Mail struct {
    Hostname   string
    Port       string
    User       string
    Password   string
    Header     map[string]string
    IsHTML     bool
    Subject    string
    Body       string
    Recipients []string
}

func New() *Mail {
    return &Mail{
        Hostname: cfg.MailHost,
        Port:     cfg.MailPort,
        User:     cfg.MailUser,
        Password: cfg.MailPass,
        Header:   map[string]string{},
        IsHTML:   true,
    }
}

func (m *Mail) AddHeader(key, value string) {
    m.Header[key] = value
}

func (m *Mail) AddRecipient(address string) {
    m.Recipients = append(m.Recipients, address)
    m.AddHeader("To", "<"+address+">")
}

func (m *Mail) HTML(isHTML bool) {
    m.IsHTML = isHTML
}

func (m *Mail) Send() error {

    if m.Subject == "" {
        m.Subject = "Some random subject..."
    }
    m.AddHeader("Subject", m.Subject)

    if _, ok := m.Header["From"]; !ok {
        m.AddHeader("From", cfg.MailName+" <"+cfg.MailUser+">")
    }

    if m.IsHTML {
        m.AddHeader("MIME-version", "1.0;")
        m.AddHeader("Content-Type", "text/html; charset="UTF-8";")
    }

    body := ""
    for k, v := range m.Header {
        body += fmt.Sprintf("%s: %srn", k, v)
    }
    body += "rn" + m.Body

    auth := smtp.PlainAuth("", m.User, m.Password, m.Hostname)

    err := smtp.SendMail(
        m.Hostname+":"+m.Port,
        auth,
        m.User,
        m.Recipients,
        []byte(body),
    )

    if err != nil {
        return err
    }
    return nil
}

MailHost = "smtp.gmail.com"
MailPort = "587"