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[Giorgos Keramidas]

Vangelis <csst9541 at cs.uoi.gr> writes:

> Geia sas paidia
> 
> Mia erotisi
> Ti tha dialegatai apo ta parakato:
> 1. Sendmail
> 2. Postfix
> 3. Qmail

To sendmail einai to pio palio apo auta pou anafereis, kai mallon auto
me ta pio polla features.  Sta thetika shmeia tou anafero san
paradeigma tin upostiriksi kai gia allous tropous gia mail routing,
ektos apo to shmera diadedomeno SMTP (opws UUCP, gia paradeigma).

Sta arvntika prepei na tonisoume oti to mail-queue tou einai praktika
adunato na to pareis backup - toulaxiston stis ekdoseis pou thymamai
egw, twra mporei na exei allaksei auto - ka8ws ta arxeia exoun meros tou
i-node number sto onoma tous, kai auto allazei kata to `restore'.

Polloi tha uposthrizan oti kai to configuration tou sendmail einai apo
ta arnhtika tou stoixeia, alla autoi einai ekeinoi pou (a) den exoun
diabasei to 'sendmail' tns O'Reilly, kai (b) den exoun xrhsimopoihsei ta 
apeira .m4 macros pou exei to sendmail gia na kanei to grapsimo enos
teleiws custom sendmail.cf paixnidi.

Kai opws eixe pei paliotera o Ricudis, an sto telos anakalupseis oti
telika to na ftiaxneis to sendmail.cf me to xeri, oxi mono den se
fobizei alla sou aresei kiolas, exeis ena sigouro stoixeio gia to oti
eisai apla diestrammenos :p

				 * * *

To qmail einai upotithetai grammeno me skopo tin dimiourgia enos arketa
`secure' mail transfer agent, mia fnmn pou kateu0uvetai pros tis apeires
trupes pou to sendmail eixe anoiksei kata kairous se diafores ekdoseis
kai morfes tou unix (kuriws eksaitias tou oti einai ena terastio
monolithic executable, kai einai kai setuid).

Apo tin alli, to qmail den einai oti pio eukolo sto setup, alla
paramenei polu pio eukolo apo to sendmail.  To debugging twn lathwn pou
uparxoun sta arxeia /var/qmail/control/* omws einai to idio kruptiko me
to na prospatheis na breis giati to rewriting-rule-#120 tou sendmail.cf
apotugxanei oiktra.

To qmail omws den einai ena terastio executable, alla mia omada apo
programmata pou `sunergazontai' gia na steiloun kathe minima.  Auto
epitrepei pio prosektiki diaxeirisi twn permissions, kai ta setuid
programmata einai polu liga.  Auto kai mono, einai gia pollous arketo
gia na to protimisoun.

				 * * *

To Postfix einai upotithetai grammeno me tin filosofia tou qmail, alla
einai pros ta piso sumbato me to sendmail.  Gia paradeigma exei ki auto
ta aliases sto /etc/aliases, ki oxi sto ~alias/.qmail-xxx - opws akribws 
kai to sendmail.

Den to exo dokimasei akoma, alla epeidi to blepo se olo kai pio polla
site, me terastio traffic (opws p.x. to hub.freebsd.org pou krataei oles 
tis mailing lists tou freebsd), thelo kapoia stigmi na to dw ki auto.

Mexri tote.  Eimai apla uper tou qmail, oso ki an mou aresei na paizw me 
to sendmail.cf, giati apla to qmail to ksero pia toso kala, pou otan
xreiastei na kano kapoia pio sobari douleia apo to na ferno ta prosopika 
mou mail mesw dialup tha protimiso qmail ;)

Ki epeidi auto katelikse klassika se YAOSKP (yet another over-sized
keramidas' post)...

Ciao.

-- 
Giorgos Keramidas, <keramida at ceid.upatras.gr>
"What we have to learn to do, we learn by doing." [Aristotle]
--
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