SMTP server w/o using Twisted framework

[Steve Holden]

Gerhard Häring wrote:
> _spitFIRE wrote:
>> [looking up DNS MX records]
>> Thanks for the pointer. However, as I said currently, I can't use
>> anything other than the standard libraries.
> 
> Sure you can. You just need to get rid of the "only standard library" 
> requirement rule.
> 
> That works best by showing the alternatives to whoever set that requirement:
> 
> - use pyDNS
> - use an existing (probably non-Python) SMTP daemon
> - reimplement some parts of pyDNS yourself and develop a basic (crappy) 
> SMTP daemon yourself
> 
> For doing the latter, you should budget at least one week.
> 
> FWIW another reason why SMTP servers should retry on temporary failure 
> is that increasing use of Greylisting (*), which was precisely designed 
> to filter out mail from "crappy" servers, like botnets, and - well - 
> cheap custom written ones ;-)
> 
I'd actually use dnspython in preference to pyDNS, it's very easy to 
use. I have some MX-server lookup code somewhere in the vault, if you 
can use an external library.

regards
  Steve
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