dictionary attack

[Martin Hepworth]

Reject on the incoming NRA for invalid recipients.... See the wiki for
some examples in the config mta section

On Friday, 18 February 2011, Ejaz <mejaz at cyberia.net.sa> wrote:
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> Hello,
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> Now days there is lots of dictionary attacks towards my
> domain, find the below one of the example, would any one please help me how can
> I prevent such attacks,
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> In my Linux machine, I have postfix, MailScanner, Spamassasin
> and clamav,
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>  xulmymyzfjkaf at boutiquesearchfirm.com
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> nkanta at cyberia.net.sa
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> nm2001 at cyberia.net.sa
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> nmj at cyberia.net.sa
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> nmj_textile at cyberia.net.sa
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> nmjnn at cyberia.net.sa
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> nnasmac at cyberia.net.sa
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>                                          nnasmacb at cyberia.net.sa
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> nnasmacd at cyberia.net.sa
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> nnasmacdd at cyberia.net.sa
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> nnasr at cyberia.net.sa
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> nnsisco at cyberia.net.sa
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> noda at cyberia.net.sa
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> nomer1 at cyberia.net.sa
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> nospam at cyberia.net.sa
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>                                          notify at cyberia.net.sa
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> nour at cyberia.net.sa
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> noura at cyberia.net.sa
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> nozhamed at cyberia.net.sa
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>                                          nplumbly at cyberia.net.sa
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> ns at cyberia.net.sa
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> nsaf-riyadh at cyberia.net.sa
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> nsaurabia at cyberia.net.sa
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> Regards,
> __________________
> Ejaz
> Sr,Systems Administrator
> Middle East Internet Company (CYBERIA)
> Riyadh, Saudi Arabia
> Phone: +966-1-4647114  Ext: 140
> Mobile +966-562311787
> Fax: +966-1-4654735
> E-mail: mejaz at cyberia.net.sa
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> --
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> This message has been scanned for viruses and
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> dangerous content by
> MailScanner, and is
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> believed to be clean.
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-- 
-- 
Martin Hepworth
Oxford, UK