Blocking MX query

Tony Finch dot at
Tue Sep 4 11:37:44 UTC 2012

Ibrahim <ibrahim1 at> wrote:
> We are thinking to block MX queries on our DNS server, so only spammer that
> use their own SMTP server will got affected. [...] Any best practice to
> block MX query?

Don't do this. It won't hinder spammers and it'll cause problems for legit

f.anthony.n.finch  <dot at>
Forties, Cromarty: East, veering southeast, 4 or 5, occasionally 6 at first.
Rough, becoming slight or moderate. Showers, rain at first. Moderate or good,
occasionally poor at first.

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