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Postfix Archives: Re: Slow downstream site wedged my Postfix...

Re: Slow downstream site wedged my Postfix...

Subject: Re: Slow downstream site wedged my Postfix...
From: Andrew McNamara (andrewmconnect.com.au)
Date: Thu Jan 27 2000 - 21:27:24 CST

>As the count exceeds some threshold, Postfix inserts delays into
>the the SMTP dialog, so it still accepts mail, just a bit slower.
>If lots of mail comes in over a few connections this strategy
>effectively slows down the sender and does not affect other inbound
>mail too much. If the mail flood comes from all over the network,
>eventually the connect() queue in the kernel will fill up and client
>connections will start to time out. That's still better than Postfix
>becoming clogged up.

I was thinking about this again the other day, and it occured to me
that it would result in all the available smtpd's tarpitting sessions
with mail to slow sites while mail for fast sites miss out, which was
the situation I was having problems with in the first place (1 bad
apple messing up mail for several thousand others). Or have I missed
something?

 ---
Andrew McNamara (System Architect)

connect.com.au Pty Ltd
Lvl 3, 213 Miller St, North Sydney, NSW 2060, Australia
Phone: +61 2 9409 2117, Fax: +61 2 9409 2111

This archive was generated by hypermail 2b27 : Thu Jan 27 2000 - 21:45:35 CST