Man, they'll try anything to hack your system...

[Bill McGonigle]

On Jan 28, 2006, at 15:24, Dan Jenkins wrote:

> What experience have folk had tightening restrictions, like lack of MX 
> or A or mis-matched MX/PTR pair?
> Does it still cause a lot of false rejections?

I turned on the postfix restriction:

   smtpd_sender_restrictions = reject_unknown_sender_domain

a couple days ago and found some servers I take care of had a hosts 
line like:

   127.0.0.1    kermit localhost  localhost.localdomain

and so mails would go out claiming to be from 
<root at localhost.localdomain>

I fixed the hosts line and now mails come through.

I consider postfix to be working properly in this case and the fedora 
core installer to be the misbehaver here.

-Bill

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