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
Limit the number of destinations (recipients) allowed in an e-mail.
Limit the number of e-mails per minute or half minute or whatever
frequency you observe as their pattern.
Put in a SPAM filter on outgoing mail and drop SPAM.
Block repeated violations from from 1 IP.
Just lock them out for a
A few things you can do:
1. Many spammers can switch their IP address but you should blacklist any ip
that signs up for an account and spam, it will slow them down at least
2. The 100 cap per day is a good idea but I'd lower it to 5 messages a day,
increasing by a couple messages cap per week.
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 create an account and w
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
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 outbound spam is at least harder
>> than blocking inbound
>> 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 need an anti-virus
> - you "can" us
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 need an anti-virus
-
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
>>
>> I'm configuring a simple p
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
; -- 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
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
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