Golang Full Step (TLS +ssl) to send mail via QQ

This is a creation in Article, where the information may have evolved or changed.

Open Mail First

2 "Settings" account tab found

This will be based on your account security to add a secret insurance, add a secret will give you a key

(2) Verification of the secret warranty

(3) Obtaining the Authorization code

This authorization code will be used.

Advance notice: SSL, TLS, are different protocols

First we use the STARTTLS protocol to write a simple example 1

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Package Mainimport ("NET/SMTP" "Strings" "FMT") func sendtomail (user, PWD, host, to, subject, body, mailtype string) error{HP: = Strings. Split (Host, ":") Auth: = SMTP. Plainauth ("", User, PWD, hp[0]) var content_type string if Mailtype = = "html" {content_type = "Content-type:tex t/"+ Mailtype +"; Charset=utf-8 "} else {content_type =" content-type:text/plain "+"; Charset=utf-8 "} msg: = []byte (" to: "+ to +" \r\nfrom: "+ user +" \r\nsubject: "+subject+" \ r \ n "+ Content_Type +" \r\n\r\n "+ Body" send_to: = Strings.   Split (To, ";") ERR: = SMTP.   SendMail (host, auth, user, send_to, msg) return Err}func main () {User: = "2677031999@qq.com"//The address of the mailbox where you opened the SMTP mailbox PWD: = "GV**************JFH"//here fill in your own authorization code host: = "smtp.qq.com:25" To: = "2677031999@qq.com"//Destination Address Subject: =      "Send mail using Golang" body: = '  
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Okay, because the SSL protocol is needed for a lot of time.
 
 
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Package Mainimport ("FMT" "Net/smtp" "Crypto/tls" "Net" "Log") func main () {host: = "smtp.qq.com" Port: =465 Email: = "2677031999@qq.com" pwd: = "gvd************fh"//fill in your authorization code here Toemail: = "2677031999@qq.com"//Destination Address Hea Der: = Make (map[string]string) header["from"] = "test" + "<" +email+ ">" header["to"] = Toemail header["Subjec T "] =" message header 11111 "header[" content-type "] =" Text/html;chartset=utf-8 "Body: =" This is a message sent by Golang "message: =" "fo R k,v: =range header{message + = FMT. Sprintf ("%s:%s\r\n", k,v)} message + = "\ r \ n" +body Auth: =smtp. Plainauth ("", email, pwd, host,) Err: = Sendmailusingtls (FMT.      Sprintf ("%s:%d", host, Port), auth, email, []string{toemail}, []byte (Message),) if Err!=nil{ Panic (ERR)}}//return a SMTP Clientfunc Dial (addr string) (*SMTP. Client, error) {conn, err: = TLS. Dial ("TCP", addr, nil) if err! = Nil {log. PANICLN ("Dialing Error:", err)     return nil, err}//Decomposition host port string Host, _, _: = Net. Splithostport (addr) return SMTP. Newclient (conn, host)}//refer to Net/smtp's func SendMail ()//using NET. Dial the TLS (SSL) port is connected, SMTP. When Newclient () is stuck and does not prompt for Err//len (to) >1, To[1] begins with a hint of Bcc sendmailusingtls (addr string, auth SMTP. Auth, from string, to []string, MSG []byte) (err error) {//create SMTP client c, err: = Dial (addr) If err! = Nil {log. Println ("Create smpt Client Error:", err) return err} defer c.close () if auth! = nil {If ok, _: = C.exte Nsion ("AUTH"); OK {if Err = C.auth (Auth); Err! = nil {log. Println ("Error during AUTH", err) Return err}}} If Err = C.mail (from);      Err! = Nil {return Err} for _, Addr: = range to {if Err = c.rcpt (addr); Err! = Nil {return err  }} W, err: = C.data () if err! = Nil {return Err} _, Err = W.write (msg) if err! = Nil {return ERR} err = W.close () if err! = Nil {RETurn err} return C.quit ()} 
 
 
 
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In fact, you observe the two methods very similar to the Golang official library NET/SMTP support is STARTTLS,, to support SSL will be the above example is just to convert net Dial to TLS.