Sorry, I forgot to post to the list!

Matthew Seaman schrieb:
> Peter Ulrich Kruppa wrote:
>> Steve Bertrand schrieb:
>>> Peter Ulrich Kruppa wrote:
>>>> for some time now I keep receiving spam mails from my
>>>> own (small) mail server, some of them with faked
>>>> usernames some of them even with my own ([EMAIL PROTECTED]).
>>> The only way to tell for certain is to review the headers
>>> of the message.
>> Received: from ( .br [] (may be
>> forged)) by (8.14.2/8.14.2) with SMTP id
>> m7RGmXTN038419 for <[EMAIL PROTECTED]>; Wed, 27 Aug 2008
>> 18:48:34 +0200 (CEST) (envelope-from [EMAIL PROTECTED])
> It's a simple forgery by the spammer.  They just claim to be
> sending from your domain because there are apparently people
> that run internet connected mail systems where doing that
> makes it easier to inject spam... Either that, or the spammers
> figure they'll get you with the bounce-o-gramme even if the
> first delivery doesn't work.
> There are a number of measures you can take against such
> things.  One thing that is pretty easy to implement is to set
> up SPF records in the DNS.  This won't stop the spammers
> attacking you this way, but it does mean that spamassassin
> will award them lots of spam points and probably reject the mail.
> If you're using sendmail as your MTA, then look at
> implementing the following features in your $(hostname).mc:
Would that mean a file called
in my case? Since I get
    # hostname
or do I leave away the .net ?



> FEATURE(greet_pause, `5000')dnl ## 5 seconds FEATURE(block_bad_helo)dnl FEATURE(badmx)dnl FEATURE(require_rdns)dnl
> These are pretty cheap resource wise and block many of the
> most egregious spammers.  There's a lot more you can do than
> that in setting up sendmail to be spam-resistent -- much more
> than I can describe in an e-mail like this.
> Cheers,
> Matthew


Peter Ulrich Kruppa


Peter Ulrich Kruppa
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