====== Checken ob E-Mail-Adresse existiert mit netcat ======

===== Beispiel =====
MX-Server bestimmen

<konsole>
me@localhost /home/me $ dig fahrrad-wiki.org MX

; <<>> DiG 9.9.5-2-Debian <<>> fahrrad-wiki.org MX
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16845
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;fahrrad-wiki.org.		IN	MX
;; ANSWER SECTION:
fahrrad-wiki.org.	3600	IN	MX	20 ALT1.ASPMX.L.GOOGLE.COM.
fahrrad-wiki.org.	3600	IN	MX	10 ASPMX.L.GOOGLE.COM.
;; Query time: 43 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Fri Jun 20 13:13:37 CEST 2014
;; MSG SIZE  rcvd: 89
</konsole>

E-Mail-Check
<konsole>
me@localhost /home/me $ nc ALT1.ASPMX.L.GOOGLE.COM 25

220 mx.google.com ESMTP u2si9268391pbz.202 - gsmtp

EHLO fahrrad-wiki.org

250-mx.google.com at your service, [95.91.210.238]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250-ENHANCEDSTATUSCODES
250 CHUNKING
mail from: <admin@fahrrad-wiki.org>
250 2.1.0 OK u2si9268391pbz.202 - gsmtp
rcpt to: <admin@fahrrad-wiki.org>
250 2.1.5 OK u2si9268391pbz.202 - gsmtp
rcpt to: <nichtvorhanden@fahrrad-wiki.org>
550-5.1.1 The email account that you tried to reach does not exist. Please try
550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at
550 5.1.1 http://support.google.com/mail/bin/answer.py?answer=6596 u2si9268391pbz.202 - gsmtp
QUIT
221 2.0.0 closing connection ez5si9836197pbc.174 - gsmtp
</konsole>

===== Siehe auch =====

  * [[dig]]
  * [[netcat]]