[Sussex] Securing Mail Servers

[Jamie L. Penman-Smithson]

On 20 Apr 2006, at 11:13, Jon Fautley wrote:
> Ronan Chilvers wrote:
>> Sorry - forgot to include greylisting - very useful technique  
>> which is
>> extremely effective at combatting spam.
>
> Be careful with comments like that - yes, it's very effective at
> combatting spam, as long as you take the time and effort to  
> configure it
> correctly.
>
> I used to run Greylisting back before it was 'cool' - and it sucked.
<snip generalisations>
> Oh, and when you do get it working, remember that you're quite  
> likely to
> get randomly delayed emails, and lose email coming from broken  
> servers.

If they don't retry after a 4xx error, they are violating the SMTP  
RFCs, are hideously broken and until they fix it I really don't want  
their mail. :)

The reason people don't fix broken mail servers is because everyone  
lays back and accepts it as the norm.

-j


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