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Subject: Re: RBL use and unavailable RBL servers
From: Andrew McNamara (andrewmconnect.com.au)
Date: Wed Nov 01 2000 - 17:22:20 CST

>I follow the Lyris list. They're currently complaining about Yahoo's
>very slow SMTPD's effectively tarpitting large percentages of Lyris'
>SMTP processes, effectively slowing overall Lyris deliveries.
>
>How would postfix react to such slow SMTPD sessions and can postfix
>be made more "impatient" to decide more quickly to abort the
>sesssion, defer the msg, and free up its SMTP client process slot?

I have smtp_connect_timeout set to 30 seconds on all our machines (and
this dates back to sendmail days). I suspect it does cause some sites
to be permanently unreachable - I have zero sympathy for people who set
up mail systems without maintaining them correctly.

There are a bunch of other timeouts you can tune, but the connect one
does it for me:

smtp_connect_timeout = 30
smtp_data_done_timeout = 600
smtp_data_init_timeout = 120
smtp_data_xfer_timeout = 180
smtp_helo_timeout = 300
smtp_mail_timeout = 300
smtp_quit_timeout = 300
smtp_rcpt_timeout = 300

 ---
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