/postfix_sender_address_verification.shtml
- Original Message -
From: "Matus UHLAR - fantomas"
To: "postfix-users"
Sent: Monday, May 20, 2019 9:01:56 AM
Subject: Re: Postfix still rejecting with 450 while I have 550 in
unverified_recipient_reject_code ?
On 20.0
= yes. Also, if there is a temporary DNS problem, Postfix automatically converts permanent errors to temporary ones.
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Matus UHLAR - fantomas:
Seems that I assumed too much, e.g. that since TLS isn't mandatory on SMTP
port, starttls and thus tlsproxy isn't important. Perhaps starttls could be
avoided by setting:
postscreen_discard_ehlo_keywords = starttls
On 09.05.19 13:34, Wietse Venema wrote:
That would
>Matus UHLAR - fantomas:
>> does it make sense to run tlsproxy when post-220 tests are not run?
On 03.05.19 12:40, Wietse Venema wrote:
>tlsproxy is required when:
>
>- postscreen: always when the server announces STARTTLS.
>
>- smtp client: always when connection
On 03.05.19 12:40, Wietse Venema wrote:
Matus UHLAR - fantomas:
does it make sense to run tlsproxy when post-220 tests are not run?
tlsproxy is required when:
- postscreen: always when the server announces STARTTLS.
- smtp client: always when connection reuse for TLS is enabled
Hello,
does it make sense to run tlsproxy when post-220 tests are not run?
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Fucking
Matus UHLAR - fantomas:
if I didn't set amavisfeed_destination_concurrency_limit, the queue manager
would try connect to amavisfeed up to default_destination_concurrency_limit
(20) times, until it failed, so effectively it should work the same, correct?
On 02.05.19 13:55, Wietse Venema wrote
Matus UHLAR - fantomas:
I use amavisd-new as content filter on a few mailservers.
main.cf:
content_filter=amavisfeed:[127.0.0.1]:10024
master.cf:
amavisfeed unix- - n - 5 lmtp
servers have different number of CPUs and I'd like to avoid overloading them
mails being checked in parallel.
I can limit those by configuring "maxproc" in master.cf or
amavisfeed_destination_concurrency_limit in main.cf.
Any recommendations for using either one?
Thanks
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to
e (e.g. my own
system's valid hostnames and IPs, *.local, etc.)
having local host name there (REJECT) could help much, at least here many
spambots in the past have used my hostname trying to spam me.
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT
get that error with the username of "john" while mail to jsmith goes through fine.
Is it possible to send the user name to the milter after virtual maps have been
applied?
spamass-milter has the "-x" option which should do just what you want.
I just haven't tested
elo_access hash:/etc/postfix/check_helo_access
Oddly enough, I have only ever had to whitelist
root@mail ~ # cat /etc/postfix/check_helo_access
fwd-out.cmp.livemail.co.uk OK
The same here (multiple servers). Rarely need it.
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
It may be acceptable when your server is used for initial submission,
otherwise better don't do that.
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results ?
if the results are in cache, yes.
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Linux is like a teepee: no Windows, no Gates
is sent
back.
the common behaviour is to reject the recipient/mail in which case sending
bounce is up to the mail client.
Abusers won't bounce.
discarding the e-mail may be fine instead, but only for valid recipients.
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I
e program continue (having logged that
parameter value was unacceptable)
than refuse to operate at all.
You apparently want postfix to work even if it's clearly misconfigured.
Well, you can patch it locally then. and then deal with consequences.
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I don't have lysdexia. The Dog wouldn't allow that.
" in
the system.
you should configure postfix to look at dovecot's virtual address database,
so it knows which users exist and which do not.
Look at:
http://www.postfix.org/VIRTUAL_README.html
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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, different view explained.
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Remember half the people you know are below average.
direct mail to postmaster account? And if I don't, will I
get double-bounce?
Matus UHLAR - fantomas:
is there a reason to accept replies to DSNs, which should not be replied to?
On 03.04.19 08:45, Wietse Venema wrote:
So as not to make a bad situation worse. This may be an unnatuural
approach for
MON (or
whatever empty_address_recipient says).
is there a reason to accept replies to DSNs, which should not be replied to?
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tunnel received.
4. postfix would not try to ban localhost.
just remove that stunnel.
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"Where
On 26 Mar 2019, at 14:47, Matus UHLAR - fantomas wrote:
if the mailing list doesn't modify existing headers, DKIM signatures
are
valid but they don't align, so DMARC policy is violated.
On 26.03.19 15:40, Bill Cole wrote:
No: without modification of From, the original DKIM signature does
om header does not align with the domain value in the DKIM-Signature
header, the DMARC policy of the signing domain is irrelevant.
if the mailing list doesn't modify existing headers, DKIM signatures are
valid but they don't align, so DMARC policy is violated.
DMARC sucks pretty much.
--
Matus UH
der:" header but they
generate new one.
DMARC required the From: to be aligned with SPF mailfrom.
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are generally completely fake. They
are spammed indiscriminately to users the scammer knows nothing
about.
one of my accounts leaked some time ago too. I recommend to do that, we
can't be sure if the alert is fake
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish
smtpd_relay_restrictions = permit_mynetworks,
permit_sasl_authenticated, reject_unauth_destination
On 3/21/19 1:44 PM, Matus UHLAR - fantomas wrote:
neither does this. this only disables unauthenticated relaying, but
allows
incoming mail/spam from unauthenticated clients.
On 21.03.19 16
their
ISP.
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Windows 2000: 640 MB ought to be enough for anybody
On 3/20/19 7:35 PM, Matus UHLAR - fantomas wrote:
On 20.03.19 16:26, Yassine Chaouche wrote:
Requiring authentication to relay on 25 will also get rid of spam.
it will also get rid of incoming mail from other mail servers...
On 21.03.19 09:18, Yassine Chaouche wrote:
Which we want anyway
login/pass – something most spammers don't have.
On 20.03.19 16:26, Yassine Chaouche wrote:
Requiring authentication to relay on 25 will also get rid of spam.
it will also get rid of incoming mail from other mail servers...
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk
)
So if the blame is on the client, what replacements for msmtp do you recommend?
this is clearly the msmtp issue. I would think that the msmtp author expects
you to clear the list of recipients to only contain valid addresses.
I don't know about any other SW with msmtp's functionality.
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Matus UH
the trusted IPs.
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"The box said 'Requires Windows 95 or better', so I bought a Macintosh".
it's
really uncertain whether it wouldn't make bigger load than just rechecking.
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Spam
. It doesn't
pick up much, but every little helps.
looking at it now, I got error 522 between cloudflare and abuseipdb reported
:)
and it looks like just another blacklist.
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ttribute', just like MAIL_ATTR_ENCODING. Then have the queue manager
read it ffrom queue file just like MAIL_ATTR_ENCODING.
You may want to do some sanity checks such that Postfix will
not accept mail that is already expired.
Wietse
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mail.
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Eagles may soar, but weasels don't get sucked into jet engines.
to
drop the connection until the TTL has expired?
spamhaus provides records with 60s TTL. Since the next connect came 10
minutes later, the TTL expired already.
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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_dnsbl_threshold = 1
postscreen_dnsbl_timeout = 10s
postscreen_dnsbl_whitelist_threshold = 0
postscreen_greet_action = enforce
postscreen_greet_banner = $smtpd_banner
postscreen_greet_ttl = 1d
postscreen_greet_wait = ${stress?{2}:{6}}s
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UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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Honk if you love peace and quiet.
of receiving problems.
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I just got lost in thought. It was unfamiliar territory.
On Feb 25, 2019, at 2:46 PM, Matus UHLAR - fantomas wrote:
Milter is BQCF. It processes the mail during scanning, and afaik its
functionality can replace both smtp_proxy and check_policy_service.
And, you can do multiple milters.
It just can't modify mail body, only headers, but you usually
Anyway is there any alternative to opendmarc that would be compatible with
BQCF? I realize a good place for that would be inside Amavisd-new, but
this feature is not available :/
On 23 févr. 2019, at 23:03, Matus UHLAR - fantomas wrote:
whatever it is, running it as milter with your setup
realize a good place for that would be inside Amavisd-new, but
this feature is not available :/
whatever it is, running it as milter with your setup won't help. post-queue
filter might do that, or get rid of pre-queue filter, e.g. use amavisd-new
through amavis-milter.
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Matus UHLAR - fantomas, uh
via
spamassassin rules.
btw I would consider replacing milter-greylist with postscreen.
http://www.postfix.org/POSTSCREEN_README.html
Thus you could reduce number of third party software and complexity of your
mail server setup.
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantoma
. Current opendkim versions may require newer
libraries, newer postfix etc.
However, this is not a postfix issue.
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help much, as long as other rate
limiting tricks and other techniques mentioned in this thread.
Unfortunately I have already encountered case where account was used dor
spreading spam, slowly to notice, where rate limiting wouldn't (i think it
didn't) help.
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Matus UHLAR - fantomas, uh
t port 465 default options contain also another options:
"-o smtpd_client_restrictions=permit_sasl_authenticated,reject"
that should be used there.
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Varov
Matus UHLAR - fantomas skrev den 2019-02-20 10:59:
Christos Chatzaras skrev den 2019-02-19 12:23:
Also we use Postfix relays with Rspamd checking the From header (we
don't allow users to spoof From address) and doing rate limits (500
e-mails / hour). If someones tries to send more e-mails
and it will be sent to 2bounce_notice_recipient (which is postmaster by default)
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"To Bo
we have some time to
manually check.
On 19.02.19 14:02, Benny Pedersen wrote:
you have users that can write 500 emails in one hour ?
yes, bigger companies that send newsletters or notifications to even their
users.
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk
iginal sender.
When double bounce occurred, I thought that "from = "
would be output, but as far as I confirmed it was "from = <>". If double
bounce occurs, will not "from = " appear?
the double bounce did not occur, at least not in the logs above.
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Mat
rently good enough for the CBL.
It is not. As you said, your reverse DNS was "ip-XX.aws.internal", and
thus generic name. the HELO name was just "smtp".
They were two different reasons leading to CBL listing.
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http:/
we can continue without
error.
yes, apparently some of the docs could be little more explicit about
$hostname or $smtp_helo_name should be a FQDN.
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Varovanie: na
On January 31, 2019 11:10:50 AM UTC, Matus UHLAR - fantomas
wrote:
while debian and ubuntu LTS have 2-year cycle and 5-year LTS support, yes,
that can get near 8 years behind.
On 31.01.19 11:22, Jim Popovitch wrote:
Debian has no strict release cycles, and Debian's LTS is based on several
support, yes, that
can get near 8 years behind.
otoh, it may be acceptable to drop support if a release is very hard to
maintain
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uld
be used for this purpose.
what exactly do you want to achieve? If you want to store mail but pretend
it has been rejected (5xx code), postfix does not support this and you must
do this outside of postfix.
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Warning: I w
that it's hard for us to know why does gmail say that
your mail server is misconfigured. Especially when you haven't provided any
such message.
It's gmail or other servers who say that and we (at least some of us) don't
maintain gmail servers.
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http
Hello,
does anyone use pflogsumm and reject based on header/body checks?
If so, can you test or provide me (privately) same logs of those rejections?
On 11.01.19 15:43, Matus UHLAR - fantomas wrote:
I have made a small patch for counting milter rejections in pflogsumm.
I put it on http
at made it
into debian package, available here:
http://test.fantomas.sk/pflogsumm-postscreen.patch
seems that original author doesn't care (have tried to contact him at least
3 times). I will try with people having repositories on github (where the
original author doesn't maintain it anymore).
both have rate limits.
https://support.asperasoft.com/hc/en-us/articles/216128628-How-to-disable-rsyslog-rate-limiting
It is time to update the Postfix page on LINUX logging brain damage.
oh, please... systemd and rsyslog. I use sysvinit+syslog-ng wherever
possible, on linux
--
Matus UHLAR
On 07.01.19 14:11, Paul Martin wrote:
Do you know how to balance outgoing emails with multiple IP addresses with
postfix ?
(I do not have randmap on my postfix)
what exactly are you trying to achieve?
To delay outgoing mail for anyone using greylisting?
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Matus UHLAR - fantomas, uh
On 05.01.19 22:26, Philippe - Forums wrote:
I would like to filter SMTP access using geo-localization.
tried searching in your SW distribution?
% apt-cache search geoip postfix
mtpolicyd - modular policy daemon for postfix
https://www.mtpolicyd.org/
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Matus UHLAR - fantomas, uh
On 05.01.19 08:37, Rafael Azevedo wrote:
Can the reinjection port be other than 10025 ?
it can be any port, but it has to be configured not to send mail back
to the filter not to create a loop.
there are other recommended options for such port, documented in filter
readme.
--
Matus UHLAR
sex, 4 de jan de 2019 às 18:36, Matus UHLAR - fantomas
escreveu:
>> You forgot to send it back into Postfix.
On 04.01.19 16:47, Rafael Azevedo wrote:
>Would you please tell me how to send it back to POSTFIX ?
call sendmail and pass te message to it, or sent it to postfix via
postfix doesn't send it to your content filter again.
it's explained in http://www.postfix.org/FILTER_README.html#principles
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is this milter running properly?
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Spam is for losers who can't get business any other way.
cy server doesn't look to your "smtp_tls_policy_maps" settings,
usually it does not read postfix configuration at all.
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it's safe
to use them as relay. However, the mail is less in your hands then, and you
may need their help to solve problems.
I would use ISPs relay only in cases of blacklisting.
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stion is, how do you send the mail?
if you sre using script that calls "mail" command, it's possible that the
mail command generates From: using full host name instead of domain name.
that may not be postfix's fault
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Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Wa
DNS records
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The 3 biggets disasters: Hiroshima 45, Tschernobyl 86, Windows 95
. unfortunately it
doesn't cover all the situation yet.
I need more hack suggestion..
Matus UHLAR - fantomas
it's better (and often safer) to archive logs instead of while mail.
On 20.12.18 22:22, d tbsky wrote:
I need to archive the whole mails and related info. I think it's a
common
Matus UHLAR - fantomas
isn;t it easier to save one copy of mail with the logs, instead of two
copied of mail, without logs?
Note that logs will show e.g. when mail was refused by destination server,
mail won't.
On 20.12.18 21:50, d tbsky wrote:
I don't know if it is easier. but what I want
il was refused by destination server,
mail won't.
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Linux - It's now safe to turn on your comput
dnsbl.sorbs.net*1
postscreen_blacklist_action = drop
postscreen_dnsbl_action = enforce
Am i missing something obvious?
on some systems I have implemented postscreen with especially to avoid refusing
mail just because of a single dnsbl listing.
on some systems the google ranges are whitelisted.
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Matus UHLAR
tfix mailing lists. Since then, and until 4 days ago, it had always
worked as expected, and never given me reasons to remember its
existence. Do you mean that the "flags=D" setting is obsolete in the
current version of postfix?
it's not obsolete, but the filtering through procmail like th
n such case, this MTA must
accept certificate of your client's postfix server.
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I intend to live forever - so far so good.
will do what you want for all mail passing your server
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Eagles may soar, but weasels don't
On 06.12.18 15:45, Dominic Raferd wrote:
>I am using incrond to monitor an mbox file (in /var/mail) for changes,
On Fri, 7 Dec 2018 at 09:15, Matus UHLAR - fantomas
wrote:
hmmm, why?
maybe there's other way to implement your requirement
On 07.12.18 10:22, Dominic Raferd wrote:
The
On Mon Dec 03 2018 04:27:43 Matus UHLAR - fantomas
said:
pleaase, get a decent MUA, not applemail that tries to encode everything as
internet links (and messes up thge plaintext version of mail).
On Dec 6, 2018, at 3:00 AM, Matus UHLAR - fantomas wrote:
X-Mailer: Apple Mail
*_count/rate_limit restrictions, according to:
http://www.postfix.org/postconf.5.html#smtpd_client_event_limit_exceptions
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On Mon Dec 03 2018 04:27:43 Matus UHLAR - fantomas
said:
pleaase, get a decent MUA, not applemail that tries to encode everything as
internet links (and messes up thge plaintext version of mail).
On 04.12.18 13:47, @lbutlr wrote:
What do you base this statement on? I’ve been using
to split this? to allow relaying some domains
only when coming from IP 'A' and some other domains only when coming from
IP 'B'
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I
believe many could be left default.
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Boost your system's speed by 500% - DEL C:\WINDOWS\*.*
On 29.11.18 09:09, Francesc Peñalvez wrote:
it may be a silly question but.Which option is appropriate to reject
emails from ip without ip resolved
you apparently mean "reject_unknown_client_hostname" in smtpd_*_restrictions
settings
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Matus UHLAR - fantomas, uh...@fantomas
On Wed, 2018-11-28 at 10:03 +0100, Matus UHLAR - fantomas wrote:
But I prefer dehydrated over bloated certbot.
On 28.11.18 09:49, Jim P. wrote:
This comes up enough to warrant the following questions:
1) What do you do about restarting services after automatic cert
renewals in the middle
not explain what's
happening.
I guess you got all you really need to handle the problem.
- fix invalid forward/redirect
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it exactly what is needed in these
cases. Those ports were even designed for this purpose...
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have experience with
this?
I have no problem with Let's Encrypt certificates and postfix/whatever.
I'm just not sure if iphones have the root CA (DST Root CA X3) installed -
just yesterday noticed a complaint.
But I prefer dehydrated over bloated certbot.
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Matus UHLAR - fantomas, uh
=3DA9=3F=3D_Rodier?=
this looks to me like encoded twice, so all clients that decode it once will
show once encoded string.
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are sending too much mail to www-d...@allegro.pl and they refuse it.
It's send from MAILER-DAEMON which means someone send mail from
www-d...@allegro.pl
to you. search for such mail.
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, that do not exist.
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WinError #98652: Operation completed successfully.
On 08.11.18 01:31, Kai Schaetzl wrote:
Thanks for the answer. But, please look again.
/etc/mail/access:
createsend.com REJECT
cmail20.com REJECT
On 08.11.18 12:06, Matus UHLAR - fantomas wrote:
you should specify .createsend.com, because the connecting domain is
mx17
lient_access hash:/etc/mail/access,
-> this is first in order and contains matching data!
> check_sender_access hash:/etc/mail/access,
-> but it matches only in the next step!
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/POSTSCREEN_README.html
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"They say when you play that M$ CD backward you can hear satanic messages.&quo
ail package. Apparently the one
provided in solaris 11.3.
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(R)etry, (A)bort, (C)ancer
On 26.10.18 09:27, Poliman - Serwis wrote:
I have one more question which is more less related with main thread. I
would like to know can I block port 25 on firewall?
2018-10-26 10:01 GMT+02:00 Matus UHLAR - fantomas :
not if you want to send and receive mail.
[...]
However, if you
er, if you are not a service provider, don't simply block 25, if you
want to send/receive mail.
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&qu
it as such.
for now, many companies use port 465 as authenticated submission-only port.
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yes, such projects should test that, too.
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The 3 biggets disasters: Hiroshima 45, Tschernobyl 86, Windows 95
protocol:s23_srvr.c:578:
On Wed, Oct 24, 2018 at 5:01 PM Matus UHLAR - fantomas
wrote:
which OS/distribution do you use?
On 24.10.18 17:50, Burn Zero wrote:
I use CentOS 6.5
On 25.10.18 09:10, Matus UHLAR - fantomas wrote:
I haven't find centos 6.5 nor redhat 6.5 here, but on one of our
/POSTSCREEN_README.html#white_veto
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One OS to rule them all, One OS to find them,
One OS to bring them all
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