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.
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