add a mailsrv repo

go.mod

@@ -0,0 +1,3 @@
+module mailsrv
+
+go 1.18

main.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"fmt"
+	"net/smtp"
+	"os"
+	"strings"
+)
+
+const (
+	SMTPServer string = "smtp.ionos.fr"
+	SMTPUser   string = "admin@thegux.fr"
+	SMTPPort   string = "25"
+)
+
+type Email struct {
+	Sender    string
+	Receivers []string
+	Subject   string
+	Content   string
+}
+
+func NewEmail(sender string, receivers []string, subject, content string) Email {
+	return Email{
+		Sender:    sender,
+		Receivers: receivers,
+		Subject:   subject,
+		Content:   content,
+	}
+}
+
+func (e Email) Generate() []byte {
+	mail := fmt.Sprintf(
+		"To: %s\nFrom: %s\nContent-Type: text/html\nSubject: %s\n\n%s",
+		strings.Join(e.Receivers, ","),
+		e.Sender,
+		e.Sender,
+		e.Content,
+	)
+	return []byte(mail)
+}
+
+func main() {
+	fmt.Println("sending Thegux email test...")
+
+	content := fmt.Sprintf("Hi!<br/><br/>This is an e-mail test, please do not reply.<br/><br/>Thegux Administrator<br/>%s", `<hr/>visit the website: <a href="https://thegux.fr">thegux.fr</a>`)
+	email := NewEmail(SMTPUser, []string{"receiver@receiver.com"}, "e-mail test", content)
+
+	auth := smtp.PlainAuth("", SMTPUser, "<password>", SMTPServer)
+	fmt.Println("authentication: ok")
+
+	if err := smtp.SendMail(SMTPServer+":"+SMTPPort, auth, email.Sender, email.Receivers, email.Generate()); err != nil {
+		fmt.Printf("error while sending email, err=%v\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Println("email send successfully")
+}