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From: Spahn, Daniel (DSpahncuh2a.com)
Date: Wed Dec 03 2008 - 06:02:19 CST
My setup is using the defaults, but the connection is so flaky that even pings don't return consistently. My current setup no longer delivers mail, but I get lots of timeout errors, and it looks like most messages end up in the defer queue. Any ideas? This is a highly political situation and the people responsible for fixing the problem will not work with me, yet I am responsible for the proper functioning of this email system. Anything that even has a slight chance of working will be greatly appreciated. To give a better picture of the setup, I have a professional-grade multifunction device that scans, faxes, prints, copies, etc.. It has a fixed IP on the LAN. Its scans go out to the postfix server, which is connected to a Cisco switch, Netgear firewall, and Cisco router/CSU/DSU. I have authentication turned on and it only accepts mail from the multifunction device. It's not a high-traffic system- it just occasionally has to send a few scans over email. I have administrative access to the whole network, except the router/CSU/DSU (but any changes can be requested if needed). Any advice that can mitigate the poor line quality is appreciated.
From: Noel Jones [mailto:njonesmegan.vbhcs.org]
Sent: Tuesday, December 02, 2008 5:06 PM
To: Spahn, Daniel
Subject: Re: FW: Help Needed with odd configuration...
Spahn, Daniel wrote:
> I am running A recent build of Postfix on a Gentoo server- I am pretty
> sure it is about 3-4 months old. The problem I have is that the line the
> mail is sent out on is buggy- I get lots of packet sequence errors, slow
> speeds, etc. I need any advice I can get on configuring fault
> tolerance-type options. This is a simple setup, and I am not talking
> about clustering or failovers, simply how to set things so that things
> that time out get retried a few minutes later, possibly several times to
> mitigate the middle-of-the-day traffic rushes, as well as other network
> spikes. Does anyone have any suggestions as to retry options, timeout
> values? I am relatively inexperienced with MTA configuration, but I have
> managed to get a couple of MTA's working in the past. Thanks!
The defaults should give pretty good performance with good
tolerance for a flaky connection.
If you find the defaults insufficient, here are some relevant
Just as general info, if the connection stays active but is
really slow (regardless if it's due to bandwidth or
transmission errors) mail should keep flowing and the default
settings should work well.
If the connection drops frequently, mail will be deferred and
may have trouble ever getting delivered. There isn't a good
workaround in postfix (or any MTA I know of) for a connection
that drops frequently.