I am sending emails in one of my projects through command line. The project
back end is written in Golang. I am using following code to send emails:
package utils
import(
"bytes"
"html/template"
"os/exec"
"fmt"
)
type EmailRequest struct{
EmailTo string
EmailSubject string
EmailBody string
}
func (request *EmailRequest) EmailSend(notificationTemplateData
interface{}) (bool, error) {
subject, errParse := ParseTemplate(request.EmailSubject,
notificationTemplateData)
body, errParse := ParseTemplate(request.EmailBody,
notificationTemplateData)
if errParse != nil{
return false, errParse
}
err := ExecuteMailCommand("mail -s \"$(echo \" "+subject+" \nMIME-version:
1.0;\nContent-Type: text/html;charset=\"UTF-8\";\n\")\" "+request.EmailTo,
body)
if err != nil {
return false, err
}
return true, nil
}
func ParseTemplate(templateHtml string, data interface{}) (string, error) {
var body string
t, err := template.New("test").Parse(templateHtml)
if err != nil {
return body, err
}
buf := new(bytes.Buffer)
if err = t.Execute(buf, data); err != nil {
return body, err
}
body = buf.String()
return body, nil
}
func ExecuteMailCommand(command string, body string) error {
cmd := exec.Command("sh", "-c", command)
cmd.Stdin = bytes.NewBufferString(body)
stdout, err := cmd.CombinedOutput()
if err != nil {
fmt.Printf("%v\n", err)
return err
}
fmt.Printf("%s\n", stdout)
return nil
}
But while sending email through this code, strange thing is happening.
Sometimes the email is delivered immediately. But sometimes it is not
delivered even upto somehours. The server is running on AWS.
I am not getting the reason why it is behaving like this. Do I need to set
some server mail configurations or there is some problem in the code ?/
Thanks!
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