Ir al contenido principal

Ralsina.Me — El sitio web de Roberto Alsina

SMTP servers are hell

At least in the sense that they are re­al­ly full of peo­ple with bad in­ten­tion­s...
  • The red stripe are con­nec­­tions blocked be­­cause the sender is list­ed in spam­­cop.

  • The blue stripe is con­nec­­tions blocked be­­cause the sender is in NJABL.

  • The dark­­er green stripe is con­nec­­tions that are rate-lim­it­ed be­­cause they look like a DOS or ad­­dress spam (client con­nec­t­ing too quick­­­ly)

The top green line is SMTP con­nec­tion­s.

The thin white stripe is re­al con­nec­tions that we al­low to send email.

Of course when you look at those...
  • 42% are spam (yes, the fil­ter is quite ef­­fi­­cien­t).

So, about 1 in 5 con­nec­tion at­tempts ac­tu­al­ly in­tends to send a re­al, good, valid email.

I am amazed this email thinga­ma­jig still work­s.

E.Galland / 2006-09-13 10:21:


is it the result of your qmrtg rewriting for munin?
If so, would you share your work? (and maybee submit it directly to munin team?)


Roberto Alsina / 2006-09-13 14:11:

Yup, the first graph is one of my plugins.

I have 5 done and there are still a few more to go.

It's not adequate for inclusion in munin because it relies heavily on external tools to pre-munch the logs, but I will post it here soon.

Contents © 2000-2023 Roberto Alsina