Uwe Driessen wrote:

> 
> Diese Maskierungen machen es ungleich schwerer das log zu lesen.

Ja, wollte nur mich ganz Klar an die Richtlinien für das posting in die 
maillist halten. 
Ich paste mal das selbe log nicht so sehr modifiziert.

> 
> Wie viele Domains sind dahinter, gehören die alle zu Hauptdomain?
> Sind das virtualdomains oder Relaydomains zu denen da zugestellt werden 
> soll/wird?

Zwei Relaydomains: relaydomain1.com un relaydomain2.com

> Verwendest du irgendwo catchall oder Adressrewriting's? (master.cf, Amavis 
> einträge
> überprüfen)

Nein, nur relay_recipients. Kein Amavis, kein spamassasin, nur Postfix. Ist nur 
ein incomming mail-relayer für 2 domains.

> Du hast den Parameter unverified_recipient_reject_code noch auf dem default 
> 450 stehen 
> Mit unverified_recipient_reject_code = 550 werden ungültige Adressen sofort 
> abgewiesen 

Ja, ich habe darüber gelesen und würde gerne nicht einsetzen, bin mit der 
default "Antwort" zufrieden wenn es defaultmäßig gehandelt würde, also die 
Email "defern", aber nicht zustellen.
Mir geht es mehr ums verstehen und andere Sendungen vorzubeugen, warum in der 
gleichen Connection 4-5 mal richtig gehandelt wird, aber einmal zugestellt 
wird. Aus den logs geht hervor das das andere System nach den 1en versuch, 
plötzlich eine Email ohne FROM sendet und das Postfix diese zustell ohne 
weitere Überprüfungen zu machen (reject_unknown_sender_domain status=0, zum 
Beispiel).

Ich habe dieses Problem mit nur 2 Sendern, das andere sendet mit 
[email protected], was da geschieht ist noch schlimmer, da rejected Postfix mit 
ein 550 code, ist zudem noch in der sender_access list, wird aber trotzdem 
zugestellt:

Apr 26 04:01:30 mx53 postfix/smtpd[16412]: connect from 
not-ourdomain2.net[263.33.207.158]
Apr 26 04:01:30 mx53 postfix/smtpd[16412]: NOQUEUE: reject: RCPT from 
not-ourdomain2.net[263.33.207.158]: 550 5.7.1 <[email protected]>: Sender 
address rejected: Spam is not accepted here; from=<[email protected]> 
to=<[email protected]> proto=ESMTP helo=<linux2.host>
Apr 26 04:01:31 mx53 postfix/smtpd[16412]: 415FD4009F: 
client=not-ourdomain2.net[263.33.207.158]
Apr 26 04:01:31 mx53 postfix/cleanup[16609]: 415FD4009F: 
message-id=<[email protected]>
Apr 26 04:01:31 mx53 postfix/qmgr[6322]: 415FD4009F: from=<>, size=3971, 
nrcpt=1 (queue active)
Apr 26 04:01:31 mx53 postfix/smtp[16610]: 415FD4009F: 
to=<[email protected]>, relay=277.34.169.7[277.34.169.7]:25, delay=0.56, 
delays=0.54/0/0.01/0.01, dsn=2.0.0, status=sent (250 2.0.0 n3Q21nCr027931 
Message accepted for delivery)
Apr 26 04:01:31 mx53 postfix/qmgr[6322]: 415FD4009F: removed
Apr 26 04:01:31 mx53 postfix/smtpd[16412]: disconnect from 
not-ourdomain2.net[263.33.207.158]

:sender_access
[email protected] 550 No MLM thanks
linux2.host 550 Spam is not accepted here
[email protected] REJECT
dom.tld REJECT
[email protected] OK

Wir haben täglich etwa 100.000 Zustellungen zu relaydomain1.com, davon werden 
etwa 2000 Emails relayt, der rest wird rejected hauptsächlich, außer diese zwei 
Sender.


> Schau die auch mal die Parameter 
> smtpd_soft_error_limit =
> smtpd_hard_error_limit =
> smtpd_error_sleep_time =
> unknown_client_reject_code
> unknown_address_reject_code
> unknown_hostname_reject_code
> unknown_client_reject_code

Die docu habe ich mir zigmal von oben bis unten durchgelesen und in andere 
Systeme probiert bevor ich gepostet habe, nur das oben geschilderte Problem 
kann ich nicht im test-server wieder reproduzieren da es sehr selten vorkommt, 
2 mal am tag von 2 verschiedene Sendern unter etwa 10.000 Sendern. Abgesehen 
davon, wie du oben am log und an der sender_access list sehen kannst, die 
zweite mail darf unter keinem Umstand zugestellt werden, tuts aber.

[...]
> die Sender restriktionen  leeren und in den recipient_restriktionen 
> einarbeiten.

Die sache ist die, ich muß unbedingt in jeden restriction-stage in der lage 
sein ein Sender zu erlauben zu senden ohne dabei das mailsystem zu weit zu 
öffnen, komm aber mit unseren ersten postfix-server und den restriction-stages 
nicht ganz klar.

> z.B. 
> smtpd_recipient_restrictions = reject_non_fqdn_sender, 
>    reject_non_fqdn_sender,
>    reject_unknown_sender_domain,
>       reject_non_fqdn_recipient, 
>       reject_unknown_recipient_domain, 
>       check_sender_access hash:/etc/postfix/sender_access, 
>       reject_unknown_sender_domain, 
>       permit_mynetworks, 
>       reject_unauth_destination, 
>    check_sender_access hash:/etc/postfix/sender_access,
>       reject_invalid_helo_hostname, 
>       reject_non_fqdn_helo_hostname, 
>       reject_rbl_client zen.spamhaus.org, 
>       reject_rbl_client dnsbl.sorbs.net, 
>       reject_rbl_client cbl.abuseat.org

Ok, werde ich versuchen!
Danke nochmals Uwe.

> 
> Mit freundlichen Grüßen
> 
> Drießen

--
Grüsse auch,
Andres

Log nicht ganz obfuscated und etwas formatiert:

Apr 25 00:25:30 mx53 postfix/smtpd[7713]: connect from 
183.not-our-domain.net[999.96.183.68]

Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 220 mx53.relaydomain1.com ESMTP (GTK)

Apr 25 00:25:30 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: EHLO server.inexistentdomain.org
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-mx53.relaydomain1.com
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-PIPELINING
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-SIZE 52428800
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-VRFY
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-ETRN
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: match_list_match: 
183.not-our-domain.net: no match
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: match_list_match: 999.96.183.68: no 
match
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-STARTTLS
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-ENHANCEDSTATUSCODES
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-8BITMIME
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 DSN

Apr 25 00:25:30 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: STARTTLS
Apr 25 00:25:30 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 220 2.0.0 Ready to start TLS

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: EHLO server.inexistentdomain.org
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-mx53.relaydomain1.com
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-PIPELINING
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-SIZE 52428800
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-VRFY
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: match_list_match: 
183.not-our-domain.net: no match
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: match_list_match: 999.96.183.68: no 
match
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-ETRN
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-ENHANCEDSTATUSCODES
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250-8BITMIME
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 DSN

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: MAIL 
From:<[email protected]> SIZE=911

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.1.0 Ok

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RCPT To:<[email protected]>

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: resolve_clnt: `' -> 
`[email protected]' -> transp=`smtp' host=`[260.66.345.7]' 
rcpt=`[email protected]' flags= class=relay

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: NOQUEUE: reject: RCPT from 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found; 
from=<[email protected]> to=<[email protected]> proto=ESMTP 
helo=<server.inexistentdomain.org>

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unknown_sender_domain status=2

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: DATA
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 554 5.5.1 Error: no valid recipients

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: MAIL From:<> SIZE=1935

Apr 25 00:25:31 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.1.0 Ok

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RCPT To:<[email protected]>

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unknown_sender_domain status=0

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: >>> END Sender address RESTRICTIONS 
<<<
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: >>> START Recipient address 
RESTRICTIONS <<<

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unknown_sender_domain status=0

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: generic_checks: name=permit_mynetworks
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: permit_mynetworks: 
183.not-our-domain.net 999.96.183.68
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: match_hostname: 
183.not-our-domain.net ~? 127.0.0.0/8
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: match_hostaddr: 999.96.183.68 ~? 
127.0.0.0/8
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: match_list_match: 
183.not-our-domain.net: no match
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: match_list_match: 999.96.183.68: no 
match
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: generic_checks: 
name=permit_mynetworks status=0
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unauth_destination
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: reject_unauth_destination: 
[email protected]
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: permit_auth_destination: 
[email protected]
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: ctable_locate: leave existing entry 
key [email protected]
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unauth_destination status=0

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: >>> END Recipient address 
RESTRICTIONS <<<
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: >>> CHECKING RECIPIENT MAPS <<<

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: maps_find: relay_recipient_maps: 
hash:/etc/postfix/relay_recipients(0,lock|fold_fix): [email protected] = OK
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: mail_addr_find: [email protected] 
-> OK
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: smtpd_check_rewrite: trying: 
permit_inet_interfaces
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: permit_inet_interfaces: 
183.not-our-domain.net 999.96.183.68
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: before input_transp_cleanup: cleanup 
flags = enable_header_body_filter enable_automatic_bcc enable_address_mapping 
enable_milters
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: after input_transp_cleanup: cleanup 
flags = enable_header_body_filter enable_automatic_bcc enable_address_mapping
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: connect to subsystem public/cleanup

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.1.5 Ok
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: DATA

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 354 End data with <CR><LF>.<CR><LF>

Apr 25 00:25:32 mx53 postfix/cleanup[8856]: 2C3DD4009F: 
message-id=<[email protected]>

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok: queued as 2C3DD4009F

Apr 25 00:25:32 mx53 postfix/qmgr[29560]: 2C3DD4009F: from=<>, size=3262, 
nrcpt=1 (queue active)
Apr 25 00:25:32 mx53 postfix/smtp[8857]: 2C3DD4009F: 
to=<[email protected]>, relay=260.66.345.7[260.66.345.7]:25, delay=0.57, 
delays=0.45/0/0.01/0.11, dsn=2.0.0, status=sent (250 2.0.0 n3OMPmtV029038 
Message accepted for delivery)
Apr 25 00:25:32 mx53 postfix/qmgr[29560]: 2C3DD4009F: removed

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: MAIL 
From:<[email protected]> SIZE=842

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.1.0 Ok

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RCPT To:<[email protected]>

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: NOQUEUE: reject: RCPT from 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found; 
from=<[email protected]> to=<[email protected]> proto=ESMTP 
helo=<server.inexistentdomain.org>

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unknown_sender_domain status=2

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: DATA
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 554 5.5.1 Error: no valid recipients

Apr 25 00:25:32 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:32 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: MAIL 
From:<[email protected]> SIZE=842

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.1.0 Ok

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RCPT To:<[email protected]>

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: NOQUEUE: reject: RCPT from 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found; 
from=<[email protected]> to=<[email protected]> proto=ESMTP 
helo=<server.inexistentdomain.org>

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unknown_sender_domain status=2

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: DATA
Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 554 5.5.1 Error: no valid recipients

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok
A
Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: MAIL 
From:<[email protected]> SIZE=842

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.1.0 Ok

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RCPT To:<[email protected]>

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: NOQUEUE: reject: RCPT from 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found; 
from=<[email protected]> to=<[email protected]> proto=ESMTP 
helo=<server.inexistentdomain.org>

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unknown_sender_domain status=2

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: DATA
Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 554 5.5.1 Error: no valid recipients

Apr 25 00:25:33 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:33 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:34 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok
A
Apr 25 00:25:34 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: MAIL 
From:<[email protected]> SIZE=911
Apr 25 00:25:34 mx53 postfix/smtpd[7713]: extract_addr: input: 
<[email protected]>

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.1.0 Ok

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RCPT To:<[email protected]>

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: NOQUEUE: reject: RCPT from 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found; 
from=<[email protected]> to=<[email protected]> proto=ESMTP 
helo=<server.inexistentdomain.org>

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: generic_checks: 
name=reject_unknown_sender_domain status=2

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 450 4.1.8 
<[email protected]>: Sender address rejected: Domain not found
Apr 25 00:25:34 mx53 postfix/smtpd[7713]: watchdog_pat: 0x7f192f9cf8c0
Apr 25 00:25:34 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: DATA
Apr 25 00:25:34 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 554 5.5.1 Error: no valid recipients

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: RSET
Apr 25 00:25:34 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 250 2.0.0 Ok

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: < 
183.not-our-domain.net[999.96.183.68]: QUIT
Apr 25 00:25:34 mx53 postfix/smtpd[7713]: > 
183.not-our-domain.net[999.96.183.68]: 221 2.0.0 Bye

Apr 25 00:25:34 mx53 postfix/smtpd[7713]: disconnect from 
183.not-our-domain.net[999.96.183.68]


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