FYI: antispam kolpo

[Spiros Bolis]

On Tue, 27 Feb 2007, V13 wrote:

> H esy den to katalabes kala, h ego... Den enoo ayto:

egw 3erw to e3hs:

exeis kapoioys MX servers oi opoioi einai monimws epanw - dld. den
yparxei logos na paei kapoio mail se MX me xamhloterh proteraiothta
ektos ki an pisteyei o dagkas poy stelnei oti exeis ligotera metra
antispam kai "xtyphsei" apeytheias aytoys. Esy twra les: "A, afoy to
mail an htan kanoniko eprepe na paei ston megalyterhs proteraiothtas MX,
o bines paei na moy thn kanei nomizontas oti tha perasei eykolotera tis
saboyres soy", ki ekei efarmozeis ta diafora soy px. toys kaneis
greylist.

Allo endiaferon kolpo einai na stelneis non-fatal apanthseis 4xx me to 
sendmail soy kai toys les na 3anaprospathisoyn: oi spammers synithws
kanoyn hit-and-run kai den kathontai na 3anabaloyn sthn oyra ta diafora
spam. Yparxoyn bebaia kai gidoboskoi-diaxeiristes ana ton kosmo kai opws
katalabenete, xanontai mail.


Telos, kathe MX prepei na deixnei se kapoio FQDN kai oxi se IP symfwna
me kapoio RFC. opote ypothetw pws kati tetoio symbainei me thn periptwsh
poy aneferes