Wietse, you're the best!
Thank you very very much :)
- Original Message -
From: "Wietse Venema"
To: "postfix-users"
Sent: Monday, May 13, 2019 4:46:57 PM
Subject: Re: Postfix as an outgoing spam filter. How to block email for unknown
senders in loca
Wietse Venema:
> sandermo...@telenet.be:
> > Can't we use the 'smtpd_sender_restrictions = check_sender_access
> > ...' option on port 26 only using parameters in master.cf ?
>
> Yes.
>
> /etc/postfix/master.cf
>:26 .. .. .. .. .. .. .. smtpd
> -o { smtpd_sender_restrictions=$outbound
sandermo...@telenet.be:
> Can't we use the 'smtpd_sender_restrictions = check_sender_access
> ...' option on port 26 only using parameters in master.cf ?
Yes.
/etc/postfix/master.cf
:26 .. .. .. .. .. .. .. smtpd
-o { smtpd_sender_restrictions=$outbound_sender_restrictions }
/etc/post
On 2019-05-13 12:03 BST, sandermo...@telenet.be wrote:
> The hackers forged the from address so our notifications were sent
> to that address instead, and we want to prevent that from happening
> again.
I'm offering the following in the hope that someone will tell me if
it's all wrong...
a) Add a
Sander
- Original Message -
From: "Wietse Venema"
To: "postfix-users"
Sent: Monday, May 13, 2019 1:16:12 PM
Subject: Re: Fwd: Postfix as an outgoing spam filter. How to block email for
unknown senders in local network?
sandermo...@telenet.be:
> After some googli
Wietse Venema:
> sandermo...@telenet.be:
> > After some googling I found that the "reject_unknown_sender_domain"
> > option should reject mail if Postfix isn't the sender's domain
> > final destination so that sounds good too. I enabled that option
> > but it doesn't seem to work?
>
> It works as
sandermo...@telenet.be:
> After some googling I found that the "reject_unknown_sender_domain"
> option should reject mail if Postfix isn't the sender's domain
> final destination so that sounds good too. I enabled that option
> but it doesn't seem to work?
It works as promised.
reject_unknown_
We have a postfix system that accepts mail from our internal network. It scans
emails for virusses and spam before delivering it.
It's listening on port 26 and so far everything works.
Last night one of our users's mailbox got hacked and they tried to send a lot
of spam emails. Most of it got
On Sat, Apr 18, 2015 at 11:16 AM, Chuck Peters wrote:
>
>
> I'm researching migrating some Exim servers to Postfix and would like to
> implement automatic blocking of compromised and spammers' accounts with
> notifications to staff. Any suggestions?
>
>
>
We are successfully using Postfix, Poli
s@postfix.org
Subject: Blocking compromised accounts (outgoing spam) and auth cracking
I'm researching migrating some Exim servers to Postfix and would like to
implement automatic blocking of compromised and spammers' accounts with
notifications to staff. Any suggestions?
On the Exim
aturday, April 18, 2015 11:35 PM
To: postfix-users@postfix.org
Subject: Re: Blocking compromised accounts (outgoing spam) and auth cracking
This sounds painfully annoying.
I hope your uses never travel, take a vacation, or go on a work trip.
And it doesn't stop or help if the user gets a virus
rs
Sent: Saturday, April 18, 2015 8:16 PM
To: postfix-users@postfix.org
Subject: Blocking compromised accounts (outgoing spam) and auth cracking
I'm researching migrating some Exim servers to Postfix and would
like to implement automatic blocking of compromised and spammers'
To: postfix-users@postfix.org
Subject: Blocking compromised accounts (outgoing spam) and auth cracking
I'm researching migrating some Exim servers to Postfix and would like to
implement automatic blocking of compromised and spammers' accounts with
notifications to staff. Any su
Am 18.04.2015 um 20:50 schrieb Viktor Dukhovni:
> On Sat, Apr 18, 2015 at 06:16:56PM +, Chuck Peters wrote:
>
>> I'm researching migrating some Exim servers to Postfix and would like to
>> implement automatic blocking of compromised and spammers' accounts with
>> notifications to staff. Any su
On Sat, Apr 18, 2015 at 06:16:56PM +, Chuck Peters wrote:
> I'm researching migrating some Exim servers to Postfix and would like to
> implement automatic blocking of compromised and spammers' accounts with
> notifications to staff. Any suggestions?
>
> On the Exim user list today someone sug
Blocking compromised accounts (outgoing spam) and auth cracking
Nowadays users' passwords often are stolen (with drive-by exploits, Windows
malware, phishing) and used for spamming. Spam sent with authentication via
your server causes it to be blacklisted without notice and sometimes no
Hello,
Many thanks to all who replied.
Many suggestion are really helpful and we have been able to stop the
spammers for now.
Best regards
--
Marcin Szymonik
szymoni...@gmail.com
n Apr 10, 2014, at 6:49 PM, LuKreme wrote:
On 10 Apr 2014, at 07:58 , Marcin Szymonik wrote:
Hello,
We run a free accounts mail server (like gmail) and we struggle with the
outgoing spam problem.
Spammers abuse our service by creating accounts and then sending out spam.
It is very easy a
rote:
>>
>> Hello,
>>
>> We run a free accounts mail server (like gmail) and we struggle with the
>> outgoing spam problem.
>> Spammers abuse our service by creating accounts and then sending out spam.
>>
>> It is very easy and free to create an accou
On 10 Apr 2014, at 07:58 , Marcin Szymonik wrote:
> Hello,
>
> We run a free accounts mail server (like gmail) and we struggle with the
> outgoing spam problem.
> Spammers abuse our service by creating accounts and then sending out spam.
>
> It is very easy and free to
As accounts are free and you can easily create tens of them, per account
limits don't solve the problem.
Most free mail service providers allow their users to send through SMTP and
we would prefer to do that as well.
Content based filtering may be the way to go indeed - thank you for pointing
it.
On 10/04/2014 14:58, Marcin Szymonik wrote:
Hello,
We run a free accounts mail server (like gmail) and we struggle with
the outgoing spam problem.
Spammers abuse our service by creating accounts and then sending out
spam.
It is very easy and free to create an account and we want it to stay
Hello,
We run a free accounts mail server (like gmail) and we struggle with the
outgoing spam problem.
Spammers abuse our service by creating accounts and then sending out spam.
It is very easy and free to create an account and we want it to stay that
way so blocking or removing spammers
On Tue, Oct 20, 2009 at 4:40 AM, Martin Schiøtz wrote:
>>> Can I do any outgoing spam checks with postfix or I'm forced to
>>> install lots of Amavis, spamassassin, etc. software to do that job.
>>>
>>
>> I'm sorry to tell you that blocking
>> Can I do any outgoing spam checks with postfix or I'm forced to
>> install lots of Amavis, spamassassin, etc. software to do that job.
>>
>
> I'm sorry to tell you that blocking outbound spam is at least harder
> than blocking inbound spam.
>
> - yo
Martin Schiøtz a écrit :
> Can I do any outgoing spam checks with postfix or I'm forced to
> install lots of Amavis, spamassassin, etc. software to do that job.
>
I'm sorry to tell you that blocking outbound spam is at least harder
than blocking inbound spam.
- you certainly
Martin Schiøtz wrote:
On Mon, Oct 19, 2009 at 2:43 PM, Mark Blackman wrote:
On 19 Oct 2009, at 13:41, Paul Cockings wrote:
What are you trying to achieve?
- why do you want anti-spam on outbound mail?
I'd guess he has little or no control over the configuration
of the "inter
Martin Schi?tz:
> On Mon, Oct 19, 2009 at 2:43 PM, Mark Blackman wrote:
> >
> > On 19 Oct 2009, at 13:41, Paul Cockings wrote:
> >
> >> What are you trying to achieve?
> >> - why do you want anti-spam on outbound mail?
> >
> > I'd guess he has little or no control over the configuration
> > of the
On Mon, Oct 19, 2009 at 2:43 PM, Mark Blackman wrote:
>
> On 19 Oct 2009, at 13:41, Paul Cockings wrote:
>
>> What are you trying to achieve?
>> - why do you want anti-spam on outbound mail?
>
> I'd guess he has little or no control over the configuration
> of the "internal" machines and so he's c
On 19 Oct 2009, at 13:41, Paul Cockings wrote:
What are you trying to achieve?
- why do you want anti-spam on outbound mail?
I'd guess he has little or no control over the configuration
of the "internal" machines and so he's concerned about malware/botnets
perhaps.
- Mark
smime.p7s
Descript
What are you trying to achieve?
- why do you want anti-spam on outbound mail?
Martin Schiøtz wrote:
Can I do any outgoing spam checks with postfix or I'm forced to
install lots of Amavis, spamassassin, etc. software to do that job.
Can I do any outgoing spam checks with postfix or I'm forced to
install lots of Amavis, spamassassin, etc. software to do that job.
- Martin
On Mon, Oct 19, 2009 at 1:59 PM, Martijn de Munnik wrote:
> On Mon, 2009-10-19 at 13:50 +0200, Martin Schiøtz wrote:
>> Hi
>>
>>
Martijn de Munnik put forth on 10/19/2009 6:59 AM:
> On Mon, 2009-10-19 at 13:50 +0200, Martin Schiøtz wrote:
>> Hi
>>
>> I'm configuring a simple postfix smtp-server that is only used for
>> outgoing emails for lots of users.
>> I want to do some simple spam checking with postfix. I was thinking o
On Mon, 2009-10-19 at 13:50 +0200, Martin Schiøtz wrote:
> Hi
>
> I'm configuring a simple postfix smtp-server that is only used for
> outgoing emails for lots of users.
> I want to do some simple spam checking with postfix. I was thinking of:
>
> rbl
> spf
RBL and SPF are techniques only used f
Hi
I'm configuring a simple postfix smtp-server that is only used for
outgoing emails for lots of users.
I want to do some simple spam checking with postfix. I was thinking of:
rbl
spf
Any other sugestions?
I'm not sure were to configure rbl and spf for outgoing emails in main.cf?
postconf -n
Robert Lopez wrote:
Thank you Aaron.
My supervisor asked me to find a configuration change to postfix. He
wants to avoid adding any new agents/programs. It seems the person I
replaced had some bad times when trying to add other programs to the
mail gateway functionality.
Postfix does have
; -- Forwarded message --
> From: Aaron Wolfe <[EMAIL PROTECTED]>
> Date: Mon, Oct 6, 2008 at 12:55 PM
> Subject: Re: outgoing SPAM
> To: postfix-users@postfix.org
>
>
> On Mon, Oct 6, 2008 at 2:33 PM, Robert Lopez <[EMAIL PROTECTED]> wrote:
>> In
: Aaron Wolfe <[EMAIL PROTECTED]>
Date: Mon, Oct 6, 2008 at 12:55 PM
Subject: Re: outgoing SPAM
To: postfix-users@postfix.org
On Mon, Oct 6, 2008 at 2:33 PM, Robert Lopez <[EMAIL PROTECTED]> wrote:
> In the past months there have been instances where pfishing was used to
get
> a
Robert Lopez a écrit :
> In the past months there have been instances where pfishing was used
> to get account credentials and use the victim's account to send
> massive quantities of SPAM.
>
> Is there a way to configure postfix to detect such an event and/or to
> stop such an event from reoccurri
On Mon, Oct 6, 2008 at 2:33 PM, Robert Lopez <[EMAIL PROTECTED]> wrote:
> In the past months there have been instances where pfishing was used to get
> account credentials and use the victim's account to send massive quantities
> of SPAM.
>
> Is there a way to configure postfix to detect such an ev
In the past months there have been instances where pfishing was used to get
account credentials and use the victim's account to send massive quantities
of SPAM.
Is there a way to configure postfix to detect such an event and/or to stop
such an event from reoccurring?
Is there a way to limit the nu
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