Reject mail from invalid domains

[Jorge Costinha]

invalid domain, are domains that cannot be resolved by DNS. i belive it 
is a good practice to reduce spam and workload of mailscanner and 
spamassassin if mails coming from invalid domains are block. am i right?



Koopmann, Jan-Peter wrote:
> On Monday, May 28, 2007 6:16 PM Jorge Costinha wrote: 
>
>
>   
>>       im using Fedora core 6, with Mailscanner 4.59.4 and sendmail
>> 8.13.8. I want to block email from invalid domains. Can i do this with
>> Mailscanner/spamassassin or has to be done at MTA level?
>>     
>
> You probably could do this with spamassassin but the MTA is the correct
> place. How do you define "invalid domain"? That's the interesting
> question. 
>
> Regards,
>   JP
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