驗證 Email 存不存在

這個 script 是使用 expect 作的，也需要 telnet 指令

基本上就是用 telnet 驗證有沒有這樣子而已

編輯 check_email_verify.exp 檔，內容如下

#!/usr/bin/expect
#
# 檢查 email 存不存在
# need expect and telnet command
#
set timeout 60
set mx [lindex $argv 0]
set em [lindex $argv 1]
spawn telnet $mx 25
expect "220"
send "EHLO $mx\n"
expect "250 "
send "MAIL FROM: <$em>\n"
send "RCPT TO: <$em>\n"
expect -re "450|550|2.1.5|ecipient.*ok"
send "QUIT\n"

執行如下指令

                              mailserver    帳號
expect check_email_verify.exp mail.ssorc.tw cross@ssorc.tw

成功的話就會是這樣子

spawn telnet mail.ssorc.tw 25
Trying xx.xx.xx.xx...
Connected to mail.ssorc.tw.
Escape character is '^]'.
220 XXXXXXXXX
EHLO mail.ssorc.tw
250-XXXXXXXXX Hello [xx.xx.xx.xx]
250-SIZE
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-X-ANONYMOUSTLS
250-AUTH NTLM
250-X-EXPS GSSAPI NTLM
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250-XEXCH50
250-XRDST
250 XSHADOW
MAIL FROM: <cross@ssorc.tw>
RCPT TO: <cross@ssorc.tw>
250 2.1.0 Sender OK
250 2.1.5 Recipient OK

有找到一個網頁 http://verify-email.org/ 也可以作這種事

MX record about ssorc.tw exists.
Connection succeeded to mail.ssorc.tw SMTP.
220 XXXXXXXXX
> HELO verify-email.org 
250 ssorc.tw Hello [verify-email.org]
> MAIL FROM: <check@verify-email.org>
=250 2.1.0 Sender OK
> RCPT TO: <cross@ssorc.tw>
=250 2.1.5 Recipient OK