Go

go 发邮件

2018-12-12  本文已影响0人  butters001

Gomail是一个简单有效的电子邮件发送包。它经过了良好的测试和文档化。
Gomail只能使用SMTP服务器发送电子邮件。但是这个API是灵活的，而且它很容易实现使用本地后缀、API等发送电子邮件的其他方法。

安装

go get gopkg.in/gomail.v2

Example ()

m := gomail.NewMessage()
m.SetHeader("From", "alex@example.com")
m.SetHeader("To", "bob@example.com", "cora@example.com")
m.SetAddressHeader("Cc", "dan@example.com", "Dan")
m.SetHeader("Subject", "Hello!")
m.SetBody("text/html", "Hello <b>Bob</b> and <i>Cora</i>!")
m.Attach("/home/Alex/lolcat.jpg")

d := gomail.NewDialer("smtp.example.com", 587, "user", "123456")

// Send the email to Bob, Cora and Dan.
if err := d.DialAndSend(m); err != nil {
    panic(err)
}

Example (守护进程)

一个后台程序用来监听 channel 和发送进来的消息

ch := make(chan *gomail.Message)

go func() {
    d := gomail.NewDialer("smtp.example.com", 587, "user", "123456")

    var s gomail.SendCloser
    var err error
    open := false
    for {
        select {
        case m, ok := <-ch:
            if !ok {
                return
            }
            if !open {
                if s, err = d.Dial(); err != nil {
                    panic(err)
                }
                open = true
            }
            if err := gomail.Send(s, m); err != nil {
                log.Print(err)
            }
        // Close the connection to the SMTP server if no email was sent in
        // the last 30 seconds.
        case <-time.After(30 * time.Second):
            if open {
                if err := s.Close(); err != nil {
                    panic(err)
                }
                open = false
            }
        }
    }
}()

// Use the channel in your program to send emails.

// Close the channel to stop the mail daemon.
close(ch)

Example (实时通信)

高效地向收件人列表发送定制的时事通讯

// The list of recipients.
var list []struct {
    Name    string
    Address string
}

d := gomail.NewDialer("smtp.example.com", 587, "user", "123456")
s, err := d.Dial()
if err != nil {
    panic(err)
}

m := gomail.NewMessage()
for _, r := range list {
    m.SetHeader("From", "no-reply@example.com")
    m.SetAddressHeader("To", r.Address, r.Name)
    m.SetHeader("Subject", "Newsletter #1")
    m.SetBody("text/html", fmt.Sprintf("Hello %s!", r.Name))

    if err := gomail.Send(s, m); err != nil {
        log.Printf("Could not send email to %q: %v", r.Address, err)
    }
    m.Reset()
}

Example (NoAuth)

使用本地SMTP服务器发送电子邮件

m := gomail.NewMessage()
m.SetHeader("From", "from@example.com")
m.SetHeader("To", "to@example.com")
m.SetHeader("Subject", "Hello!")
m.SetBody("text/plain", "Hello!")

d := gomail.Dialer{Host: "localhost", Port: 587}
if err := d.DialAndSend(m); err != nil {
    panic(err)
}

Example (NoSMTP)

使用API或postfix发送电子邮件

m := gomail.NewMessage()
m.SetHeader("From", "from@example.com")
m.SetHeader("To", "to@example.com")
m.SetHeader("Subject", "Hello!")
m.SetBody("text/plain", "Hello!")

s := gomail.SendFunc(func(from string, to []string, msg io.WriterTo) error {
    // Implements you email-sending function, for example by calling
    // an API, or running postfix, etc.
    fmt.Println("From:", from)
    fmt.Println("To:", to)
    return nil
})

if err := gomail.Send(s, m); err != nil {
    panic(err)
}

result

From: from@example.com
To: [to@example.com]

一些方法

m.SetHeader("Subject", "Hello!")

m.SetHeaders(map[string][]string{
    "From":    {m.FormatAddress("alex@example.com", "Alex")},
    "To":      {"bob@example.com", "cora@example.com"},
    "Subject": {"Hello"},
})

m.SetAddressHeader("To", "bob@example.com", "Bob")

m.SetBody("text/plain", "Hello!")
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