email - How to send an e-mail from Go -

i'm trying send e-mail in golang , have lot of problems it. i'm new in go maybe cannot find answer on doc.

this want do: 1. e-mail stdin 2. parse e-mail (getting from, to, subject, attachments , on) 3. send e-mail (put again queue in local postfix)

i did 1 , 2 have problem 3th one.

this have now:

package main   import (   "fmt"   "github.com/jhillyerd/go.enmime"   //"github.com/sendgrid/sendgrid-go"   "net/smtp"   "github.com/jordan-wright/email"   "os"   "net/mail"   "io/ioutil"   "bytes"   )  func main() {    mail_stdin, err := ioutil.readall(os.stdin)   if err != nil {       return   }    // convert type io.reader   buf := bytes.newbuffer(mail_stdin)    msg, err := mail.readmessage(buf)   if err != nil {     return   }    mime, err := enmime.parsemimebody(msg)   if err != nil {     return   }    # saving attachments   _, value := range mime.attachments {     fmt.println(value.filename())      err := ioutil.writefile(value.filename(), value.content(), 0664)     if err != nil {       //panic(err)       return     }    fmt.printf("from: %v\n", msg.header.get("from"))   fmt.printf("subject: %v\n", mime.getheader("subject"))   fmt.printf("text body: %v chars\n", len(mime.text))   fmt.printf("html body: %v chars\n", len(mime.html))   fmt.printf("inlines: %v\n", len(mime.inlines))   fmt.printf("attachments: %v\n", len(mime.attachments))   fmt.println(mime.attachments)   fmt.println(mime.otherparts)   fmt.printf("attachments: %v\n", mime.attachments) } 

i did few tests using: net/smtp, sendgrid-go , jordan-wright/email. want send e-mail (without changing anything) server queue again. of modules needs have auth, want send using sendmail, in same way can bash:

# echo "test" | mail {address} 

using net/smtp can easily... assuming have smtp server running can connect without authentication. guess you're trying accomplish it's lot easier through simple gmail ( https://www.digitalocean.com/community/tutorials/how-to-use-google-s-smtp-server )

anyway, here's couple code samples cover either case;

    c, err := smtp.dial("mail.example.com:25")     if err != nil {         log.fatal(err)     }     defer c.close()     // set sender , recipient.     c.mail("sender@example.org")     c.rcpt("recipient@example.net")     // send email body.     wc, err := c.data()     if err != nil {         log.fatal(err)     }     defer wc.close()     buf := bytes.newbufferstring("this email body.")     if _, err = buf.writeto(wc); err != nil {         log.fatal(err)     } 

alternatively here's go playground example uses simple auth; http://play.golang.org/p/atdcgjgkz3 unless you've got smtp server running on dev box following lot easier.