[Mimedefang] DNS and MX records

[Alan Premselaar]

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Kris Deugau wrote:
> netguy wrote:
>> Receintly I updated DNS for a few domains.  My registrar gives the
>> option of assigning an IP addy for domain.tld without having an alias:
>> mail.domain.tld  Ok, says I, lets give it a go.  Bam!  Slam, Spam
>> started invading my privacy.  This leads me to believe either:
>>    1. Mail ( spam ) in this case is being sent to domain names without
>> doing MX lookups.
> 
> Yep.  Spamware will certainly blindly open a connection to port 25 on
> <domain.tld>, rather than sorting through MX records.  Personally, I
> think it's "better" to have that A record in place, spam notwithstanding.
> 


If I'm not mistaken, even properly configured MTAs will revert to the A
record of a domain of there are no MX records available. (although I
haven't done any real research to back up this statement recently so I
could be completely off base)

Alan
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