Mailserver Relay-Test per Telnet

Geschrieben am 07.06.2011, 11:48 Uhr   mail post spam

Durch Zufall drauf gestoßen: Während die meisten online Relay-Checks eine Registrierung fordern, kann man bei mail-abuse.org (Anscheinend von Trend Micro übernommen) per Telnet einen Check anfordern.

Per telnet relay-test.mail-abuse.org 25 kann - vom zu prüfenden Mailserver selbst aus - ein Test initiiert werden, der Verlauf sieht dann in etwa so aus:

Trying 168.61.4.13...
Connected to cygnus.mail-abuse.org.
Escape character is '^]'.
Connecting to MY.OWN.IP.ADDR ...
<<< 220 mail.XXXXXXX.de brought to you on 100% recycled electrons ESMTP
>>> HELO cygnus.mail-abuse.org
<<< 250 mail.XXXXXXX.de brought to you on 100% recycled electrons
:Relay test: #Quote test
>>> mail from: 
<<< 250 ok
>>> rcpt to: <"nobody@mail-abuse.org">
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 1
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 2
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #test 3
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 4
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 5
>>> mail from: <>
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 6
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 7
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 8
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody%mail-abuse.org (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 9
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody%mail-abuse.org (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 10
>>> mail from: 
<<< 250 ok
>>> rcpt to: <"nobody@mail-abuse.org">
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 11
>>> mail from: 
<<< 250 ok
>>> rcpt to: <"nobody%mail-abuse.org">
<<< 550 no mailbox or alias named nobody%mail-abuse.org (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 12
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 13
>>> mail from: 
<<< 250 ok
>>> rcpt to: <"nobody@mail-abuse.org"@[MY.OWN.IP.ADDR]>
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 14
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 15
>>> mail from: 
<<< 250 ok
>>> rcpt to: <@mail.XXXXXXX.de:nobody@mail-abuse.org>
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 16
>>> mail from: 
<<< 250 ok
>>> rcpt to: <@[MY.OWN.IP.ADDR]:nobody@mail-abuse.org>
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #Test 17
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named mail-abuse.org!nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #test 18
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named mail-abuse.org!nobody (#5.5.0)
>>> rset
<<< 250 flushed
:Relay test: #test 19
>>> mail from: 
<<< 250 ok
>>> rcpt to: 
<<< 550 no mailbox or alias named nobody (#5.5.0)
>>> rset
<<< 250 flushed
>>> QUIT
<<< 221 mail.XXXXXXX.de brought to you on 100% recycled electrons
Tested host banner: 220 mail.XXXXXXX.de brought to you on 100% recycled electrons ESMTP
System appeared to reject relay attempts

Schaut schonmal garnicht so schlecht aus.

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