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Subject: Re: Tens of thousands of messages stuck in incoming?
From: Andrew McNamara (andrewmconnect.com.au)
Date: Wed Apr 05 2000 - 19:27:16 CDT

> I'm wondering if anyone has any ideas why we'd get outbound mail
>relay servers that have tens of thousands of messages stuck in the
>incoming directory, and not being processed by the rest of the system.

We saw this when the active queue had more than qmgr_message_active_limit
jobs for one *very* slow site - that site ended up taking up all the active
slots, and nothing could be moved out of incoming.

Increasing qmgr_message_active_limit, and adding a transport table entry
to offload the offending sites mail somewhere else fixed it in our case.

The latest version of postfix has a huristic that can help in this
situation. From the changelog:

- Workaround to prevent one site with a huge backlog from blocking
  all other deliveries. This is controlled by a new configuration
  parameter qmgr_site_hog_factor (default: 90 percent) that limits
  how much in-memory queue manager resources a site can claim.

 ---
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