AW: warning: hostname foo.bar.us does not resolve to address IP-Adresse : Temporary failure in name resolution

Di Apr 25 13:17:49 CEST 2017

Hallo,

den Log-Eintrag "warning: hostname .* does not resolve to address .*" siehst Du, wenn reject_unknown_client_hostname _nicht_ gesetzt ist. Dieses ist restriktiver als reject_unknown_reverse_client_hostname, welches Du verwendest. Auszug Postfix-Doku:

reject_unknown_client_hostname (with Postfix < 2.3: reject_unknown_client)
Reject the request when 1) the client IP address->name mapping fails, 2) the name->address mapping fails, or 3) the name->address mapping does not match the client IP address.
This is a stronger restriction than the reject_unknown_reverse_client_hostname feature, which triggers only under condition 1) above.

Christian

-----Ursprüngliche Nachricht-----
Von: Postfixbuch-users [mailto:postfixbuch-users-bounces at listen.jpberlin.de] Im Auftrag von t.berthel at gmx.net
Gesendet: Dienstag, 25. April 2017 12:45
An: postfixbuch-users at listen.jpberlin.de
Betreff: warning: hostname foo.bar.us does not resolve to address IP-Adresse : Temporary failure in name resolution

Hallo und danke für deine Antwort. 

> du hast ja schon reject_unknown_reverse_client_hostname in deiner
> config, ich könnte mir nur vorstellen, dass irgendwo in
> check_client_access hash:/etc/postfix/smtpd_access,
> check_client_access hash:/etc/postfix/tld_access,
> ein whitelisting erfolgt das nicht beabsichtigt ist?

Ich habe meine withlists alle auf die Möglichkeiten hin geprüft, jedoch keinen Fehleintrag gefunden.
Erst nachdem ich die IP in meine Liste smtpd_access hinterlegt hatte wurde diese wie gewünscht blockiert. Aber da sehe ich mich "Don Quijote" vor der Windmühle wenn ich das immer befüllen darf ;)

Jetzt habe ich einen neuen Fall aus Received: from xpijn.yandex.ru (unknown [14.162.204.43]):

Apr 25 12:10:55 MAIL-GATEWAY postfix/smtpd[15724]: warning: hostname static.vnpt.vn does not resolve to address 14.162.204.43
Apr 25 12:10:55 MAIL-GATEWAY postfix/smtpd[15724]: connect from unknown[14.162.204.43]
Apr 25 12:10:59 MAIL-GATEWAY postfix/smtpd[15724]: 6D52E1CA04A: client=unknown[14.162.204.43]
Apr 25 12:11:00 MAIL-GATEWAY postfix/cleanup[15746]: 6D52E1CA04A: message-id=<1067707414.20170425131052 at freenet.de>
Apr 25 12:11:00 MAIL-GATEWAY postfix/qmgr[10223]: 6D52E1CA04A: from=<florian.schmock at freenet.de>, size=1058, nrcpt=1 (queue active)
Apr 25 12:11:00 MAIL-GATEWAY amavis[14080]: (14080-19) LMTP :10024 /var/amavis/tmp/amavis-20170425T112447-14080-FCNjE3M5: <florian.schmock at freenet.de> -> <USER.NAME at Domain.de> SIZE=1058 Received: from Domain.de ([127.0.0.1]) by localhost (Domain.de [127.0.0.1]) (amavisd-new, port 10024) with LMTP for <USER.NAME at Domain.de>; Tue, 25 Apr 2017 12:11:00 +0200 (CEST)
Apr 25 12:11:00 MAIL-GATEWAY amavis[14080]: (14080-19) Checking: BSF2-kx5ntXW [14.162.204.43] <florian.schmock at freenet.de> -> <USER.NAME at Domain.de>
Apr 25 12:11:01 MAIL-GATEWAY postfix/smtpd[15724]: disconnect from unknown[14.162.204.43] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Apr 25 12:11:01 MAIL-GATEWAY amavis[14080]: (14080-19) spam-tag, <florian.schmock at freenet.de> -> <USER.NAME at Domain.de>, No, score=2.213 required=3 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, RAZOR2_CF_RANGE_51_100=0.5, RAZOR2_CF_RANGE_E8_51_100=1.886, RAZOR2_CHECK=0.922, RDNS_NONE=0.793, T_PDS_FROM_2_EMAILS=0.01, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no
Apr 25 12:11:01 MAIL-GATEWAY postfix/smtpd[15749]: connect from localhost[127.0.0.1]
Apr 25 12:11:01 MAIL-GATEWAY postfix/smtpd[15749]: BEC5A1CA051: client=localhost[127.0.0.1], orig_queue_id=6D52E1CA04A, orig_client=unknown[14.162.204.43]
Apr 25 12:11:01 MAIL-GATEWAY postfix/cleanup[15746]: BEC5A1CA051: message-id=<1067707414.20170425131052 at freenet.de>
Apr 25 12:11:01 MAIL-GATEWAY postfix/smtpd[15749]: disconnect from localhost[127.0.0.1] ehlo=1 xforward=1 mail=1 rcpt=1 data=1 quit=1 commands=6
Apr 25 12:11:01 MAIL-GATEWAY postfix/qmgr[10223]: BEC5A1CA051: from=<florian.schmock at freenet.de>, size=1835, nrcpt=1 (queue active)
Apr 25 12:11:01 MAIL-GATEWAY amavis[14080]: (14080-19) BSF2-kx5ntXW FWD from <florian.schmock at freenet.de> -> <USER.NAME at Domain.de>, BODY=7BIT 250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as BEC5A1CA051
Apr 25 12:11:01 MAIL-GATEWAY amavis[14080]: (14080-19) Passed CLEAN {RelayedInbound}, [14.162.204.43]:49371 [14.162.204.43] <florian.schmock at freenet.de> -> <USER.NAME at Domain.de>, Queue-ID: 6D52E1CA04A, Message-ID: <1067707414.20170425131052 at freenet.de>, mail_id: BSF2-kx5ntXW, Hits: 2.213, size: 1058, queued_as: BEC5A1CA051, 906 ms
Apr 25 12:11:01 MAIL-GATEWAY amavis[14080]: (14080-19) TIMING-SA [total 833 ms, cpu 250 ms] - parse: 0.79 (0.1%), extract_message_metadata: 10 (1.2%), get_uri_detail_list: 0.70 (0.1%), tests_pri_-1000: 2.7 (0.3%), tests_pri_-950: 0.77 (0.1%), tests_pri_-900: 0.89 (0.1%), tests_pri_-400: 11 (1.4%), check_bayes: 10 (1.3%), b_tokenize: 3.3 (0.4%), b_tok_get_all: 3.0 (0.4%), b_comp_prob: 1.88 (0.2%), b_tok_touch_all: 0.15 (0.0%), b_finish: 0.67 (0.1%), tests_pri_0: 748 (89.7%), check_dkim_signature: 0.41 (0.0%), check_dkim_adsp: 82 (9.9%), check_spf: 0.22 (0.0%), check_pyzor: 0.10 (0.0%), check_razor2: 614 (73.7%), tests_pri_500: 45 (5.5%), poll_dns_idle: 39 (4.7%), get_report: 0.77 (0.1%)
Apr 25 12:11:01 MAIL-GATEWAY postfix/lmtp[15747]: 6D52E1CA04A: to=<USER.NAME at Domain.de>, relay=127.0.0.1[127.0.0.1]:10024, delay=4.5, delays=3.6/0/0/0.91, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as BEC5A1CA051)
Apr 25 12:11:01 MAIL-GATEWAY amavis[14080]: (14080-19) size: 1058, TIMING [total 910 ms, cpu 277 ms, AM-cpu 27 ms, SA-cpu 250 ms] - SMTP greeting: 1.6 (0%)0, SMTP LHLO: 0.6 (0%)0, SMTP pre-MAIL: 0.7 (0%)0, SMTP pre-DATA-flush: 2.0 (0%)1, SMTP DATA: 38 (4%)5, check_init: 0.4 (0%)5, digest_hdr: 0.3 (0%)5, digest_body: 0.1 (0%)5, collect_info: 1.3 (0%)5, check_header: 1.0 (0%)5, AV-scan-1: 9 (1%)6, spam-wb-list: 0.6 (0%)6, SA msg read: 0.5 (0%)6, SA parse: 1.1 (0%)6, SA check: 830 (91%)97, decide_mail_destiny: 4.8 (1%)98, notif-quar: 0.4 (0%)98, fwd-connect: 4.1 (0%)98, fwd-xforward: 0.7 (0%)98, fwd-mail-pip: 1.8 (0%)99, fwd-rcpt-pip: 0.1 (0%)99, fwd-data-chkpnt: 0.0 (0%)99, write-header: 0.3 (0%)99, fwd-data-contents: 0.0 (0%)99, fwd-end-chkpnt: 1.6 (0%)99, prepare-dsn: 0.6 (0%)99, report: 1.4 (0%)99, main_log_entry: 4.8 (1%)100, update_snmp: 2.1 (0%)100, SMTP pre-response: 0.3 (0%)100, SMTP response: 0.2 (0%)100, unlink-1-files: 0.2 (0%)100, rundown: 0.7 (0%)100
Apr 25 12:11:01 MAIL-GATEWAY amavis[14080]: (14080-19) size: 1058, RUSAGE minflt=39+0, majflt=0+0, nswap=0+0, inblock=0+0, oublock=328+0, msgsnd=0+0, msgrcv=0+0, nsignals=0+0, nvcsw=24+0, nivcsw=1+0, maxrss=99704+0, ixrss=0+0, idrss=0+0, isrss=0+0, utime=0.267+0.000, stime=0.010+0.000
Apr 25 12:11:01 MAIL-GATEWAY postfix/qmgr[10223]: 6D52E1CA04A: removed
Apr 25 12:11:01 MAIL-GATEWAY postfix/smtp[15750]: BEC5A1CA051: to=<USER.NAME at Domain.de>, relay=MAIL-SERVER-IP[MAIL-SERVER-IP]:PORT, delay=0.05, delays=0/0/0/0.04, dsn=2.6.0, status=sent (250 2.6.0  <1067707414.20170425131052 at freenet.de> Queued mail for delivery)
Apr 25 12:11:01 MAIL-GATEWAY postfix/qmgr[10223]: BEC5A1CA051: removed

Ich habe so das Gefühl, dass mein DNS nicht schnell genügt auf die Anfrage reagiert und er diese dann entsprechend einfach weiter verarbeitet, was aber echt seltsam ist. Hatte das Problem noch nie, erst seit einer jetzt schon längeren Zeit. Zumal <florian.schmock at freenet.de> definitiv nicht aus "static.vnpt.vn does not resolve to address 14.162.204.43" kommen kann.

Ich komm nicht weiter mit diesem Problem, forste schon alle Seiten ab bzgl diesen Fehlers.

VG