.
This can be done with a milter like MIMEDefang or MailMunge which let
you do arbitrary things to messages at each step in the mail flow. I
have used this to debug similar problems with signing and Sendmail's
not-so-obvious mods to messages based on mailer flags.
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cussion in the
SA community of deprecating sa-compile, although no concrete action has been
taken to do so.
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with it. Were I to
set up a new mail system today without legacy reliance on SA, I would
probably try using rspamd just to learn about it.
Regards.
On Wed, Apr 10, 2024 at 10:23 PM Bill Cole via Postfix-users <
postfix-users@postfix.org> wrote:
On 2024-04-10 at 05:46:36 UTC-0400 (Wed, 10 Ap
NSBL choices carefully and with an
understanding of your users and their needs. You may want to consider using
them in a more complex filtering tool like SpamAssassin where it is possible to
weight the impact of different DNSBLs to fit your needs and to make explicit
direct exemptions if you like.
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what I'm missing here.
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aildir in my account.
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to the behemoth mailbox providers
and other frustrations. I will not tell you to give up but you should
understand that it is far more difficult to do this today than it was a
decade or two ago. Most people can be better served by a good
experienced mail provider than by their own efforts.
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s explicit
design intent.
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need to do it later in the SMTP transaction.
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ow MailMate. I reply to a message with an
X-Original-To header and the MUA uses that address to compose and send
the message.
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0
virtual_alias_domains = hash:/etc/postfix/virtual_domains
virtual_alias_maps = hash:/etc/postfix/virtual_users
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have created a apps password*
>
> *In the file /etc/postfix/sasl_passwd*
> [smtp.gmail.com]:587 nuno.catar...@.pt:
The error indicates that the password and/or username were incorrect.
I believe you need to remove any spaces in the GMail app password.
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. Their usage is determined
by the specific restriction directive referencing them.
So you could have 'check_sender_access
hash:/etc/postfix/any_name_you_like' and Postfix will use that file, as
long as you populate it with access entries and 'postmap' it to create
the .db file.
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b
, but sometime
needed) you need to use check_sender_access.
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in the section titled "Reporting problems to postfix-users@postfix.org"
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> it continues to retry periodically. From the text, it appears that this
> should be a permanent failure, not temporary. Is the receiving MTA confused
> or am I?
It's a quirk of Telekom. They reject with 554 at connect when they dislike your
IP. In my experience, the email address in the
in postscreen(8) which are described in the
"AFTER 220 GREETING TESTS" section of its man page, it must send a 4xx
reply to passing clients and hope that they come back within the
positive cache timeout.
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ks.pcre:
[...]
/^.*@zimbra.example.org$/ privdom
[...]
privdom-allow:
.example.orgDUNNO
192.0.2 DUNNO
Where 192.0.2.0/24 is your privileged network and you want to allow anyone on
that network or any client with a verified hostname under example.org.
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s handled by 20 mx.b.locaweb.com.br.
# host 186.202.157.79
Host 79.157.202.186.in-addr.arpa. not found: 3(NXDOMAIN)
On 31.01.24 09:43, Bill Cole via Postfix-users wrote:
So if your load balancer isn't at 186.202.157.79, the hosts behind it
should not be announcing themselves as xpto.co
endly. E.g. syslog-generated log files do that.
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support on issues
directly related to specific IPs being blocklisted is trying to get
their spambots working. There's absolutely no excuse for it in 99% of
cases and it leads to random pointless speculation.
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It doesn't. The argument to '-u' is a key to identify a user-specific
ruleset. The spamc too (and SA generally) has no mechanism to split
envelopes or to provide multiple responses to a single submission.
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RV records
for SMTPS, forcing every MTA to replace its whole DNS logic. Also, the
info disclosure of MTA-MTA STARTTLS vs implicit TLS is less meaningful
than it is for MUA-MTA, where it exposes end user info.
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recollection that the root cause was a
remarkably stupid issue involving the formal certification.
Also worth noting: OpenSSL 1.1.1 is obsolete and has no upstream
support.
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16\221\311\000\212\000\026\0003\000g\300\236\300\242\000\236\0009\000k\300\237\300\243\000\237
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utlook.com clients before any
DNSBL checks (in the same restriction list.)
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(false positive) bystanders
get no clue of any trouble.
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ransport defined in
master.cf so that you can use it in *_transport directive in main.cf.
The Dovecot "lmtp" is the LMTP server side.
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On 2023-12-18 at 17:15:16 UTC-0500 (Mon, 18 Dec 2023 23:15:16 +0100)
Steffen Nurpmeso via Postfix-users
is rumored to have said:
Bill Cole via Postfix-users wrote in
<6039ed61-2c8f-4a12-b736-994d32632...@billmail.scconsult.com>:
|On 2023-12-17 at 09:27:36 UTC-0500 (Sun, 17 Dec 2023 06
the researcher mentions, we were not able to
actually reproduce
This is unsuprising.
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hat header.
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To unsubscribe send an email to pos
d score
appropriately, if you feel that necessary. In my opinion that's not worthwhile
because SA will do its own SPF check and if something else has just done the
needed DNS queries, they'll still be in cache. Very fast.
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ity
of your MTA, but why?
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On 2023-12-11 at 09:37:39 UTC-0500 (Mon, 11 Dec 2023 15:37:39 +0100)
Carlos Velasco via Postfix-users
is rumored to have said:
Bill Cole via Postfix-users escribió el 11/12/2023 a las 15:31:
On 2023-12-10 at 16:37:16 UTC-0500 (Sun, 10 Dec 2023 22:37:16 +0100)
Carlos Velasco via Postfix-users
ked
since it was created and semi-documented by Sendmail Inc. It is de facto
controlled by the current developers of Sendmail, but I don't believe
anyone is working to make Milter better, at least not in ways that would
break compatibility.
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. When
used as a milter, it works with what Postfix provides it (the relevant
macros) to construct a Received header for SA.
All of this is documented accurately.
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cketmap error should be able to generate from
the service side, as opposed to Postfix itself. How is your disk space
doing?
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Not Currentl
.
You can probably make it work for this case with suitable special-casing
in your configuration, but your configuration is a total mystery to
us... Also, I wouldn't consider it a worthwhile effort for most systems,
but that's your call for your environment.
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behavior.
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=
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to thwart analysis)
is a complicated and potentially dangerous task. As a transport agent,
Postfix should not be spending the resources or taking the risk of such
analysis. It is much safer to delegate that analysis to specialized
external software.
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) makes
sense for physical hosts AND they may go a very long time between
upgrades & reboots.
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sible for anyone here to even guess which one without the debugging
info suggested here:
http://www.postfix.org/DEBUG_README.html#mail
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or directory
What’s wrong with ?
You probably need to change /usr/bin/sendmail to /usr/sbin/sendmail.
(Unless Debian has done something crazy with their mail packages...)
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Not Currently
On 2023-11-11 at 12:58:04 UTC-0500 (Sat, 11 Nov 2023 17:58:04 +)
Matthias Nagel via Postfix-users
is rumored to have said:
Am Samstag, 11. November 2023, 18:51:04 CET schrieb Bill Cole via
Postfix-users:
Nope. Review the restriction list docs. PERMIT only short-circuits
the
current
.
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On 2023-11-09 at 20:25:44 UTC-0500 (Thu, 9 Nov 2023 20:25:44 -0500)
Phil Stracchino via Postfix-users
is rumored to have said:
Agh. I've been looking at mail.log on the wrong machine ALL ALONG
.
Isn't that what I said ?
kill me now
Nah, just a little told-ya-so.
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6256522656D01.
Something else I've missed?
Looking at the wrong log? Filtering out the relevant lines?
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recursive caching DNS resolver (AS ANY MTA SHOULD) it is essentially
free to "re-check" DNSBLs that postscreen has queried earlier, as the
answers will be cached. This would effectively front-load the inherent
delay of making DNSBL checks.
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that claim in a lot of malware spam...
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.
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SIZE 7680
> Out: 250-ETRN
> Out: 250-ENHANCEDSTATUSCODES
> Out: 250-8BITMIME
> Out: 250-SMTPUTF8
> Out: 250 CHUNKING
> In: MAIL FROM: SIZE=9132359
> Out: 250 2.1.0 Ok
> In: RCPT TO:
> Out: 250 2.1.5 Ok
> In: RCPT TO:
> Out: 250 2.1.5 Ok
> In: B
to the milters after the terminating
. at end-of-DATA but BEFORE it has responded to the client.
The milters can then tell Postfix whether or not to accept the message
and what changes to make to the message, such as adding headers.
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(AKA
the 'forward' feature of a mail reader
program. If you want to do this in some automated manner, perhaps
Bill Cole has some tooling suggestions.
Do I?
Oh, I guess I've earned that by repeatedly suggesting MIMEDefang (or its
sibling MailMunge) for doing things in a milter that no MTA should be
doing
use it did not.
Anyone can send a packet claiming to be from 131.130.3.111. That's
precisely how the port 25 intercept works: a middlebox sees packets on
port 25 and replies to them with packets supposedly from the target IP.
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years, back around
the turn of the millennium. That example was followed by many smaller
operations who didn't have any of AOLs mitigating attributes.
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On 2023-09-05 at 13:31:06 UTC-0400 (Tue, 05 Sep 2023 13:31:06 -0400)
Bill Cole via Postfix-users
is rumored to have said:
> 6. Many years of BAD operation has sent a steady trickle of poor innocents
> here and to the SA Bugzilla making false assertions like yours above and
> wasting e
reference to a domain found at arbitrary places within the message's
unstructured content.
More directly: If that was sent as you've described – using the .eu domain –
that domain is the problem, NOT the .space domain in the body.
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hemoth mailbox providers, but I have no specific
knowledge of the quality or affordability of any particular firm.
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_
g messages sent by reckless spammers who use VERP
only because that's what their tools do, and their spamming gets their
accounts killed or filled before their giant piles of spam have fully
delivered.
-Original Message-----
From: Bill Cole via Postfix-users
Sent: Wednesday, August 23, 20
techniques
to work with fewer errors.
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with this statement, likely an error in
translation.
All SMTP RFCs have specified that the hostname in HELO must not be
required to match the result of client IP's hostname lookup, but they
all agree that it should match.
Or, more tersely, in regexp:
s/needs NOT/does NOT need/
--
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.
but it should then send it to another tenant, correct?
You are asking a MS365 question on a Postfix mailing list.
"Should" they? Of course. They didn't. Whatever is broken in this case
is broken inside Microsoft.
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) and handle
disposition of such messages there.
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to fix Microsoft's mishandling of email. (giggles
insanely...)
But seriously, you cannot fix this problem by reconfiguring Postfix or
DNS, the changes must be done in MS365 mail routing.
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etailed coherent explanation
of why your bespoke config is breaking your system. He will be correct
about every word.
I will just say that you should remove all non-default TLS-related
settings for which you cannot give a detailed technical justification,
beyond "some random web page tol
your own threat model, but the marginal
value of the information in a Received header is rarely significant. On
the other side, it is usually possible to detect obfuscated Received
headers and it is entirely reasonable for receiving sites to see that in
a message and deem it suspect on that basis.
On 2023-07-31 at 09:34:47 UTC-0400 (Mon, 31 Jul 2023 15:34:47 +0200)
Fourhundred Thecat via Postfix-users <400the...@gmx.ch>
is rumored to have said:
On 2023-07-31 15:09, Bill Cole via Postfix-users wrote:
On 2023-07-31 at 02:43:28 UTC-0400 (Mon, 31 Jul 2023 08:43:28 +0200)
1690
tadata in the names.
Do the nioe filenames come from Thunderbird, or from the mailserver ?
TBird.
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__
ich is correct?
They produce different results because they were built with different
configurations, such that they have different embedded default
parameters, including the default location of config files. Each
'postconf' will provide the configuration truth about the Postfix
installation o
to reconstruct that all by yourself with the
underlying FOSS tools, but that's the best choice at this point.
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.
So, can I just install and configure Dovecot with Postifx delivering
mail to /var/mail?
Yes. You might find ~/Maildir more convenient in the long run, but you
can do the traditional mbox in /var/mail/ thing.
... and is Dovecot the way to go?
Yes.
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_
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> ___
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onfig
problem or some compromising bug in Postfix or Dovecot, it would be open
to all sorts of miscreants. A user who has spyware owning their machine
leaks their credentials to only one criminal spam operation. Repeatedly.
But that's very much a guess.
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. Therefore it would be unsuccessful if you were
to do this with mail that you want to relay or forward elsewhere.
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mail system doesn't have an IPv4 address, it cannot receive mail
from other machines that only have IPv4 addresses.
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you should have
some *architectural* justification for a backup MX.
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nd playing standard-compliance games
with spammers ("no-listing") for smaller systems.
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that DMARC exists does
not imply that it is entirely usable as deployed.
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in
Dovecot, it will log failures. For failed Postfix authentications, you
will see lines logged by auth-worker in the info log with the username,
remote IP, and failure type.
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reactive approach where I'm always adding
> sender_checks.pcre entries?
Have you looked into using restriction classes?
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gile, and are broken by
MTA behaviors which have been commonplace for the lifetime of the
Internet. If you reject messages based on an existing DKIM signature
not
verifying, you will reject some entirely legitimate mail for no good
reason.
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s.
NOTE WELL: DKIM signatures are notoriously fragile, and are broken by
MTA behaviors which have been commonplace for the lifetime of the
Internet. If you reject messages based on an existing DKIM signature not
verifying, you will reject some entirely legitimate mail for no good
reason.
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are differentiated by IP
address and TCP port number.
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milters that can call SA.
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is, and
there is also an in-depth README in the Postfix documentation for TLS
configuration.
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B
ve several anti spam feature enabled but i get still some messages
which are coming from subdomains or sub sub domains
Yes, indeed you do... Or you would, if I CC'd a copy of this to you
directly.
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Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scc
on the
"deep
tests" as well, but it seems to be really scary to me :)
Don't. They are not worth it.
What is the best practice here ? I am curious for your opinions.
Only use Postscreen's before-greeting tests. The "deep" tests add very
little marginal value.
--
Bill Col
for this. For
example, MIMEDefang (or its descendant MailMunge) could do this in a
filter_end() subroutine.
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Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
___
Postfix
nameservers for eurobank-direktna.rs
(the domain part of the sender address) times out for me at the moment,
which may be related to what you're seeing.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Availa
'myserver.mydomain.com 1.2.3.4' in my
hosts file, but I am not quite convinced that is the only solution.
Actual DNS is also an option, and a better one usually.
As you've chosen to pose this as a hypothetical with bogus details,
there may be complications we can't see.
--
Bill Cole
b
, I guess...)
for details.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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Postfix-users mailing list -- postfix-users@postfix.org
To unsubscribe
, you need to use an external tool such as ASF
SpamAssassin or rspamd, usually integrated with Postfix via a milter
interface.
Note that detection of specific languages in email is intrinsically
imperfect.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many
lving. Believing
that every SpamAssassin hit is a "problem" that can or should be
"solved" is simply not true.
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Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
___
ideas for how to do what people want...
Fortunately, many milters provide the tools to be selective about how to
handle different target domains.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
My understanding is that the marginal risks of TLSv1.0 are not relevant
to SMTP. It is also inherently counter-productive to prohibit TLSv1.0 if
you allow unencrypted SMTP as a fallback.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addres
, that should be replaced with:
smtp inet n - n - 1 postscreen
smtpd pass - - n - - smtpd
You can get a clean look at your master.cf settings with 'postconf -Mf'
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA
.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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spamd documentation
or whatever support channels exist for rspamd.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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