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| package main
import (
"fmt"
ht "html/template"
"log"
"math/rand"
"os"
tt "text/template"
"time"
"github.com/wneessen/go-mail"
)
// User是一个简单的类型，允许我们设置名字，姓氏和邮件地址
type User struct {
Firstname string
Lastname string
EmailAddr string
}
// 我们的发件人信息将用于FROM地址字段
const (
senderName = "ACME Inc."
senderAddr = "noreply@acme.com"
)
const (
textBodyTemplate = `Hi {{.Firstname}},
we are writing your to let you know that this week we have an amazing offer for you.
Using the coupon code "GOMAIL" you will get a 20% discount on all our products in our
online shop.
Check out our latest offer on https://acme.com and use your discount code today!
Your marketing team
at ACME Inc.`
htmlBodyTemplate = `<p>Hi {{.Firstname}},</p>
<p>we are writing your to let you know that this week we have an amazing offer for you.
Using the coupon code "<strong>GOMAIL</strong>" you will get a 20% discount on all
our products in our online shop.</p>
<p>Check out our latest offer on <a href="https://acme.com" target="_blank">https://acme.com</a>
and use your discount code today!</p>
<p>Your marketing team<br />
at ACME Inc.</p>`
)
func main() {
// 定义我们要发送邮件的用户列表
ul := []User{
{"Toni", "Tester", "toni.tester@example.com"},
{"Tina", "Tester", "tina.tester@example.com"},
{"John", "Doe", "john.doe@example.com"},
}
// 准备不同的模板
ttpl, err := tt.New("texttpl").Parse(textBodyTemplate)
if err != nil {
log.Fatalf("failed to parse text template: %s", err)
}
htpl, err := ht.New("htmltpl").Parse(htmlBodyTemplate)
if err != nil {
log.Fatalf("failed to parse text template: %s", err)
}
var ms []*mail.Msg
r := rand.New(rand.NewSource(time.Now().UnixNano()))
for _, u := range ul {
rn := r.Int31()
m := mail.NewMsg()
if err := m.EnvelopeFrom(fmt.Sprintf("noreply+%d@acme.com", rn)); err != nil {
log.Fatalf("failed to set ENVELOPE FROM address: %s", err)
}
if err := m.FromFormat(senderName, senderAddr); err != nil {
log.Fatalf("failed to set formatted FROM address: %s", err)
}
if err := m.AddToFormat(fmt.Sprintf("%s %s", u.Firstname, u.Lastname), u.EmailAddr); err != nil {
log.Fatalf("failed to set formatted TO address: %s", err)
}
m.SetMessageID()
m.SetDate()
m.SetBulk()
m.Subject(fmt.Sprintf("%s, we have a great offer for you!", u.Firstname))
if err := m.SetBodyHTMLTemplate(htpl, u); err != nil {
log.Fatalf("failed to set HTML template as HTML body: %s", err)
}
if err := m.AddAlternativeTextTemplate(ttpl, u); err != nil {
log.Fatalf("failed to set text template as alternative body: %s", err)
}
ms = append(ms, m)
}
// 通过SMTP发送邮件
c, err := mail.NewClient("smtp.example.com",
mail.WithSMTPAuth(mail.SMTPAuthPlain), mail.WithTLSPolicy(mail.TLSMandatory),
mail.WithUsername(os.Getenv("SMTP_USER")), mail.WithPassword(os.Getenv("SMTP_PASS")),
)
if err := c.DialAndSend(ms...); err != nil {
log.Fatalf("failed to deliver mail: %s", err)
}
log.Printf("Bulk mailing successfully delivered.")
}
|
