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Subject: Re: Best Way Blocking Spams
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>    What about your solutions ?

RBL is not a very effective way to block.  It helps, but other techniques 
dominate.

IMGate.MEIway.com (postfix as MX + any mailbox server)

>  I will not change my mail server
>    (sendmail) to other one (postfix/qmail) because of migration problems.

then migrate nothing, keep sendmail on your mailbox server, and run postfix 
as mx.

Len


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