On Tue, Jun 16, 2015 at 06:43:47AM -0700, Jithesh AP wrote:

> I have an attack on my mail system and the mail i got from mailer deamon is
> (got 1000s of such mails)

You've set "notify_classes" to send you too much email.

> ----------------------------------
> Transcript of session follows.
> 
>  Out: 220 ml.w8timez.com ESMTP Postfix
>  In:  HELO 54.183.212.207
>  Out: 250 ml.w8timez.com
>  In:  MAIL FROM: <fmrjk...@yahoo.com.tw>
>  Out: 250 2.1.0 Ok
>  In:  RCPT TO: <yuej...@yahoo.com.tw>
>  Out: 451 4.3.0 <yuej...@yahoo.com.tw>: Temporary lookup failure
>  Out: 421 4.7.0 ml.w8timez.com Error: too many errors
> 
> Session aborted, reason: too many errors

Not much of an attack, just an open-relay test.  Just ignore it,
and ideally arrange to not be notified about it.

> Any specific suggestions to close such attack?

    # No postmaster notices, just read the logs.
    #
    notify_classes =

-- 
        Viktor.

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