Minimal email commandline client

main.go

package main

import (
        "bytes"
        "fmt"
        "log"
        "net/smtp"
        "os"
        "os/user"
)

func die(err error) {
        if err != nil {
                log.Fatal(err)
        }
}

func main() {
        user, err := user.Current()
        die(err)

        hostname, err := os.Hostname()
        die(err)

        // Connect to the remote SMTP server.
        c, err := smtp.Dial("<your SMTP server in here>:25")
        die(err)
        defer c.Close()

        // Set the sender and recipient.
        recipient := fmt.Sprintf("%s@%s", user.Username, hostname)
        if err := c.Mail(recipient); err != nil {
                log.Fatal(err)
        }
        if err := c.Rcpt("<recipient in here>"); err != nil {
                log.Fatal(err)
        }
        // Send the email body.
        wc, err := c.Data()
        die(err)
        defer wc.Close()
        buf := bytes.NewBufferString("This is the email body.")
        if _, err = buf.WriteTo(wc); err != nil {
                log.Fatal(err)
        }
}