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pzghost/ssl_smtp_example.go

Forked from chrisgillis/ssl_smtp_example.go
Created April 2, 2022 02:15
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  1. @chrisgillis chrisgillis renamed this gist Apr 16, 2014. 1 changed file with 0 additions and 0 deletions.
    0 gistfile1.txt → ssl_smtp_example.go
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    File renamed without changes.
  2. @chrisgillis chrisgillis created this gist Apr 16, 2014.
    92 changes: 92 additions & 0 deletions gistfile1.txt
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    Original file line number Diff line number Diff line change
    @@ -0,0 +1,92 @@
    package main

    import (
    "fmt"
    "log"
    "net"
    "net/mail"
    "net/smtp"
    "crypto/tls"
    )

    // SSL/TLS Email Example

    func main() {

    from := mail.Address{"", "username@example.tld"}
    to := mail.Address{"", "username@anotherexample.tld"}
    subj := "This is the email subject"
    body := "This is an example body.\n With two lines."

    // Setup headers
    headers := make(map[string]string)
    headers["From"] = from.String()
    headers["To"] = to.String()
    headers["Subject"] = subj

    // Setup message
    message := ""
    for k,v := range headers {
    message += fmt.Sprintf("%s: %s\r\n", k, v)
    }
    message += "\r\n" + body

    // Connect to the SMTP Server
    servername := "smtp.example.tld:465"

    host, _, _ := net.SplitHostPort(servername)

    auth := smtp.PlainAuth("","username@example.tld", "password", host)

    // TLS config
    tlsconfig := &tls.Config {
    InsecureSkipVerify: true,
    ServerName: host,
    }

    // Here is the key, you need to call tls.Dial instead of smtp.Dial
    // for smtp servers running on 465 that require an ssl connection
    // from the very beginning (no starttls)
    conn, err := tls.Dial("tcp", servername, tlsconfig)
    if err != nil {
    log.Panic(err)
    }

    c, err := smtp.NewClient(conn, host)
    if err != nil {
    log.Panic(err)
    }

    // Auth
    if err = c.Auth(auth); err != nil {
    log.Panic(err)
    }

    // To && From
    if err = c.Mail(from.Address); err != nil {
    log.Panic(err)
    }

    if err = c.Rcpt(to.Address); err != nil {
    log.Panic(err)
    }

    // Data
    w, err := c.Data()
    if err != nil {
    log.Panic(err)
    }

    _, err = w.Write([]byte(message))
    if err != nil {
    log.Panic(err)
    }

    err = w.Close()
    if err != nil {
    log.Panic(err)
    }

    c.Quit()

    }