Hi list,
I’m sorry that this question has been discussed before. I am aware of
the following posts and threads:
http://www.irbs.net/internet/postfix/0609/0648.html
(Backscatter from Delivered-To headers)
http://www.irbs.net/internet/postfix/0609/0487.html
(Preventing backscatter with
I try to develop poc code for postfix content filtering. All i need is read
the 10025/tcp and send all data which i can read to 10026/tcp. Below is my
poc code. But i try to send email it doesn't work and postfix show me "451
4.3.0 Error: queue file write error".
#include
#include
#include
#inc
Hi,
If I request a (success) DSN from my Postfix server, my server responds
as expected. Usually my mail server has to deliver the mail remotely and
I would like Postfix to request a DSN from the remote server as well if
the user asked for one. Is that possible?
Kind regards,
Erik.
Hi,
I'm using a Postfix 2.9.6 and Cyrus IMAP mail system connected to an
OpenLDAP directory managed by Gosa 2.7.4.
Now I have a user (user1) which has set up e-mail forward in gosa, which
is stored in the ldap server as gosaMailForwardingAddress:
user1...@gmail.com
Now in my /etc/aliases I also
I try to develop poc code for postfix content filtering. All i need is read
the 10025/tcp and send all data which i can read to 10026/tcp. Below is my
poc code. But i try to send email it doesn't work and postfix show me "451
4.3.0 Error: queue file write error".
#include
#include
#include
#inc
G?khan Alkan:
> I try to develop poc code for postfix content filtering. All i need is read
> the 10025/tcp and send all data which i can read to 10026/tcp. Below is my
> poc code. But i try to send email it doesn't work and postfix show me "451
> 4.3.0 Error: queue file write error".
I recommend
On Wed, Apr 23, 2014 at 02:19:45PM +0200, Frederik Himpe wrote:
> Now I have a user (user1) which has set up e-mail forward in gosa, which
> is stored in the ldap server as gosaMailForwardingAddress:
> user1...@gmail.com
Presumably this is via an LDAP table in virtual_alias_maps.
> Now in my /et
Erik Logtenberg:
> If I request a (success) DSN from my Postfix server, my server responds
> as expected. Usually my mail server has to deliver the mail remotely and
> I would like Postfix to request a DSN from the remote server as well if
> the user asked for one. Is that possible?
This is not de
Hi,
RFC3207 says publicly available servers are required to support
plaintext and fallback to plaintext if cipher negotations etc fail.
wikileaks.org - self-signed cert, supports SSLv3, TLSv1, TLSv1.1 and
TLSv1.2, AnonDH, key size 2048 bits, weakest cipher essentially zero.
google.com - TTP cert
On Wed, Apr 23, 2014 at 04:21:14PM +0200, Per Thorsheim wrote:
> RFC3207 says publicly available servers are required to support
> plaintext and fallback to plaintext if cipher negotations etc fail.
Correct.
> It seems to me as if mailadmins prefer supporting "everything",
> since anything is be
Zitat von Viktor Dukhovni :
On Wed, Apr 23, 2014 at 04:21:14PM +0200, Per Thorsheim wrote:
RFC3207 says publicly available servers are required to support
plaintext and fallback to plaintext if cipher negotations etc fail.
Correct.
It seems to me as if mailadmins prefer supporting "everyt
On Wed, Apr 23, 2014 at 04:54:44PM +0200, lst_ho...@kwsoft.de wrote:
> Are there any experience with DNSSEC capable DNS Providers at the lower cost
> range suitable for KMU?
I've not looked at the cost of full-service DNS outsourcing. Some
of the .org registrars are quite cost-effective and have
Am 2014-04-23 13:39, schrieb Erik Logtenberg:
Hi,
If I request a (success) DSN from my Postfix server, my server
responds
as expected. Usually my mail server has to deliver the mail remotely
and
I would like Postfix to request a DSN from the remote server as well
if
the user asked for one. I
Den 23.04.2014 16:35, skrev Viktor Dukhovni:
> On Wed, Apr 23, 2014 at 04:21:14PM +0200, Per Thorsheim wrote:
> It seems to me as if mailadmins prefer supporting "everything",
> since anything is better than plaintext.
> Correct. This is called "opportunistic TLS". For an explanation
> of why tha
On Wed, Apr 23, 2014 at 05:53:31PM +0200, Per Thorsheim wrote:
> My worries here, as with HTTPS, is users (mailadmins?) putting way too
> much trust into it, as soon as they see a mailheader saying SSLv2
> ciphers were used.
In opportunistic TLS mode, Postfix by default sets no floor on
cipher su
I am in the process of debugging an application to Postfix error and thus have
occasion to have the maillog tailed in a session window. The vast, vast
majority of the traffic I see is spam and attempted spam most of which is
being handled by amavis-new and spamassasin.
Does the idea of configurin
> "TS" == Tim Smith writes:
TS> So to summarize, the delivery.mailspampropection.com domain has 81 A
TS> records which, when queried won't fit into a UDP packet which explains
TS> why Postfix correctly says it can't resolve the hostname.
TS> Is there some kind of fix I can employ here for th
On Wed, 23 Apr 2014, James B. Byrne wrote:
Does the idea of configuring Postfix so that external (to our network) smtp
connections are only accepted from servers identified with MX records for the
connecting IP address make any sense? Is it possible?
No, it makes no sense at all. MX records d
Are there any plans or existing projects that support connecting Postfix
to a Cassandra cluster to execute CQL queries for table lookups? Or any
other NoSQL databases?
List:
> Are there any plans or existing projects that support connecting Postfix
> to a Cassandra cluster to execute CQL queries for table lookups? Or any
> other NoSQL databases?
If someone has a plan, then they are welcome to implement it!
For a simple example see util/dict_env.c. For more
Another approach to reduce SPAM would be to use fail2ban for a
"reasonable" period to shut out IP addresses for a "reasonable" period
that are sending a "lot" of SPAM in a "short" period.
Ron
On 23/04/2014 3:56 PM, Larry Stone wrote:
On Wed, 23 Apr 2014, James B. Byrne wrote:
Does the idea o
Hi all,
Thank you for your reply.
- You recommened me that use netcat. But what for ? (debugging, sending
test email vs vs ...) Can you explain a bit more please ?
- As you said i added the code error handling. But when i run this poc code
and try to send email postfix again says me "451 4.3.0
G?khan Alkan:
> Hi all,
>
> Thank you for your reply.
Your program copies only in one direction. SMTP requires that you
copy data in both directions between the client that connects to
port 10025/tcp, and the server that listens on port 10026/tcp.
Look in with a search engine for smtpprox. It s
Hi all,
Thank you for your reply again.
I assume that receive data from 10025/tcp and send to 10026 is enough for
this purpose. But i think, i am wrong this subject. I should send data both
client which connect to 10025 and other side which i will connect to 10026.
I will explore this project na
G?khan Alkan:
> Hi all,
>
> Thank you for your reply again.
>
> I assume that receive data from 10025/tcp and send to 10026 is enough for
> this purpose. But i think, i am wrong this subject. I should send data both
> client which connect to 10025 and other side which i will connect to 10026.
>
1) I am blocking sites that:
a) send SPAM to addresses in our domain
b) have broken one of our e-mail passwords and try to send bulk mail
through our server by faking an Artifact Software user.
If postfix or spamassassin detects this behaviour, it blocks it as best
as it can (without making legi
Hi
Thanks for your replies.
Best regards
On Thursday, April 24, 2014, Wietse Venema wrote:
> G?khan Alkan:
> > Hi all,
> >
> > Thank you for your reply again.
> >
> > I assume that receive data from 10025/tcp and send to 10026 is enough for
> > this purpose. But i think, i am wrong this subjec
You can not try to start figuring out who is legit or not, it's a never
ending task and will cause you nothing but a headache.
Use SPF, DKIM and other traditional methods, utilize some RBL's.
I do block them using fail2ban for long periods of time, if someone is
identified as sending spam, there i
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