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<p>Hallo,</p>
<p>wer kann mir das hier erklären? Es kommt eine Mail an einen nicht
mehr existierenden User auf meinem Mailserver. Die wird gebounced.
Richtig so. <br>
</p>
<p>Allerdings schickt mein Server eine Mail genau an diesen Absender
zurück. Wo habe ich da ein Sicherheitsproblem? <br>
</p>
<p><br>
</p>
<p><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">Nov 11
07:50:59 linuxserver1 postfix/smtpd[3049238]: connect from
mail.kbsd.hr[161.53.155.21]
</span><br>
Nov 11 07:50:59 linuxserver1 postfix/smtpd[3049238]: discarding
EHLO keywords: CHUNKING
<br>
Nov 11 07:51:00 linuxserver1 postfix/smtpd[3049238]: Anonymous
TLS connection established from mail.kbsd.hr[161.53.155.21]:
TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
key-exchange ECDHE (P-256) server-signature RSA-PSS (4<br>
096 bits)
<br>
Nov 11 07:51:00 linuxserver1 postfix/smtpd[3049238]: discarding
EHLO keywords: CHUNKING
<br>
Nov 11 07:51:00 linuxserver1 postfix/smtpd[3049238]: D6BAB7CE0:
client=mail.kbsd.hr[161.53.155.21]
<br>
Nov 11 07:51:00 linuxserver1 postfix/cleanup[3049242]:
D6BAB7CE0: message-id=<a class="moz-txt-link-rfc2396E" href="mailto:600EE82A.8DA90DCA4725A77C@kbsd.hr"><600EE82A.8DA90DCA4725A77C@kbsd.hr></a>
<br>
Nov 11 07:51:01 linuxserver1 postfix/qmgr[3028615]: D6BAB7CE0:
from=<a class="moz-txt-link-rfc2396E" href="mailto:svinkovic@kbsd.hr"><svinkovic@kbsd.hr></a>, size=5812, nrcpt=1 (queue
active)
<br>
Nov 11 07:51:01 linuxserver1 postfix/smtpd[3049238]: disconnect
from mail.kbsd.hr[161.53.155.21] ehlo=2 starttls=1 mail=1 rcpt=1
data=1 quit=1 commands=7
<br>
Nov 11 07:51:01 linuxserver1 postfix/virtual[3049246]:
D6BAB7CE0: to=<a class="moz-txt-link-rfc2396E" href="mailto:testuser@domain.de"><testuser@domain.de></a>, relay=virtual,
delay=1.2, delays=1.1/0.02/0/0.03, dsn=5.1.1, status=bounced
(unknown user: <a class="moz-txt-link-rfc2396E" href="mailto:testuser@domain.de">"testuser@domain.de"</a>)
<br>
Nov 11 07:51:01 linuxserver1 postfix/cleanup[3049242]:
BC0A15A05F:
message-id=<a class="moz-txt-link-rfc2396E" href="mailto:20211111065101.BC0A15A05F@mail.domain.de"><20211111065101.BC0A15A05F@mail.domain.de></a>
<br>
Nov 11 07:51:01 linuxserver1 postfix/bounce[3049248]: D6BAB7CE0:
sender non-delivery notification: BC0A15A05F
<br>
Nov 11 07:51:01 linuxserver1 postfix/qmgr[3028615]: BC0A15A05F:
from=<>, size=7711, nrcpt=1 (queue active)
<br>
Nov 11 07:51:01 linuxserver1 postfix/qmgr[3028615]: D6BAB7CE0:
removed
<br>
Nov 11 07:51:04 linuxserver1 postfix/smtp[3049249]: Untrusted
TLS connection established to mail.kbsd.hr[161.53.155.21]:25:
TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
<br>
Nov 11 07:51:04 linuxserver1 postfix/smtp[3049249]: BC0A15A05F:
to=<a class="moz-txt-link-rfc2396E" href="mailto:svinkovic@kbsd.hr"><svinkovic@kbsd.hr></a>,
relay=mail.kbsd.hr[161.53.155.21]:25, delay=3.1,
delays=0/0.03/2.9/0.22, dsn=2.0.0, status=sent (250 2.0.0 Ok:
queued as BFDBD4B57EA0)
<br>
Nov 11 07:51:04 linuxserver1 postfix/qmgr[3028615]: BC0A15A05F:
removed<br>
<br>
</span></p>
<p><span style="font-family:monospace">Gruß</span></p>
<p><span style="font-family:monospace">Andreas<br>
</span></p>
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