Hi,
I would like to verify recipient address before hitting DNS RBL. But
it seems I'm unable to do this. Am I doing something wrong?
Using 32-bit Postfix 3.6.0-r0 from Alpine inside Docker container.
My main.cf file looks like this:
##### main.cf #####
mydomain=example.net
compatibility_level=3
maillog_file = /dev/stdout
mydestination=$mydomain
smtpd_recipient_restrictions = permit_mynetworks,
permit_sasl_authenticated,
reject_unauth_destination,
reject_unverified_recipient,
reject_rbl_client bogons.cymru.com
##### main.cf #####
where bogons.cymru.com is DNS RBL which conveniently blocks docker IP
address (172.17.42.1).
Telnet session (lower in this message) cites the RBL list as a block
reason, and in the mail log (at the very end of this message) I can
see a failed attempt to deliver a probe message (unknown user:
"notauser") before sending a DNS request (Client host [172.17.42.1]
blocked using bogons.cymru.com) - also note a 3 second delay before
this log message.
Am I doing something obviously wrong or can it be a quirk of my local
system (Docker version 1.6.2 on 32-bit Ubuntu 14.04)? If anybody tries
to reproduce it on different configurations - that might be also
helpful.
Thanks in advance!
##### telnet session #####
220 52fca4186025.example.net ESMTP Postfix
EHLO test.example.com
250-52fca4186025.example.net
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING
MAIL FROM:<t...@example.com>
250 2.1.0 Ok
rcpt to:notau...@example.net
554 5.7.1 Service unavailable; Client host [172.17.42.1] blocked using
bogons.cymru.com
quit
221 2.0.0 Bye
##### telnet session #####
##### mail log #####
May 12 22:35:20 52fca4186025 postfix/smtpd[81]: connect from
unknown[172.17.42.1]
May 12 22:35:56 52fca4186025 postfix/verify[85]: cache
lmdb:/var/lib/postfix/verify_cache full cleanup: retained=0 dropped=0
entries
May 12 22:35:56 52fca4186025 postfix/cleanup[86]: CC153163658:
message-id=<20210512223556.cc153163...@52fca4186025.example.net>
May 12 22:35:56 52fca4186025 postfix/qmgr[74]: CC153163658:
from=<double-bou...@52fca4186025.example.net>, size=263, nrcpt=1
(queue active)
May 12 22:35:56 52fca4186025 postfix/local[87]: CC153163658:
to=<notau...@example.net>, relay=local, delay=0.02,
delays=0.01/0.01/0/0, dsn=5.1.1, status=undeliverable (unknown user:
"notauser")
May 12 22:35:56 52fca4186025 postfix/qmgr[74]: CC153163658: removed
May 12 22:35:59 52fca4186025 postfix/smtpd[81]: NOQUEUE: reject: RCPT
from unknown[172.17.42.1]: 554 5.7.1 Service unavailable; Client host
[172.17.42.1] blocked using bogons.cymru.com; from=<t...@example.com>
to=<notau...@example.net> proto=ESMTP helo=<test.example.com>
May 12 22:36:06 52fca4186025 postfix/smtpd[81]: disconnect from
unknown[172.17.42.1] ehlo=1 mail=1 rcpt=0/1 quit=1 commands=3/4
##### mail log #####
