[Mailman-Users] "disable_dns_lookups = yes" is a very bad idea

[Ralf Hildebrandt]

* Jonathan Dill <jonathan at nerds.net>:
> Speaking ripe from experience, the Mailman FAQ suggests turning on 
> "disable_dns_lookups = yes" to improve the performance of Postfix with 
> Mailman, which kind of makes sense.  BUT in Postfix, this disables all 
> MX lookups.  So, unless you are going indirectly through a relay that is 
> going to handle MX lookups for you, Postfix will begin trying to deliver 
> e-mail to stupid addresses.

Correct.
 
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Ralf Hildebrandt (i.A. des IT-Zentrums)         Ralf.Hildebrandt at charite.de
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