I send out a list of 40k.
One recipient per SMTP session, or chunks of 20 or 30 recipients per SMTP session?
I use a separate program to handle the list on another server, but it gets sent via SMTP on the imail box.
The first 5000-6000 go out fine, then SMTP just craps out.
This is very easy to do with Imail. I can hose any IMail box with postfix and a few thousand msgs. Even limiting the number of concurrent postfix SMTP sessions.
In a situation exactly like yours, I today had to re-do one of my client's machines that was receiving IMGate but unfiltered except for unknown recipients, while his other IMGate did full filtering (and ran well). The Imail just couldn't keep up with the unfiltered volume, and he had spent a lot of time tuning w2k, Imail, all the usual hoop jumping, and talking to Ipswitch. I finally had add more filtering to his unfiltered IMGate, "sender address verification" (since he was seeing tons of forged senders), to increase the rejects, reduce the volume to Imail. Imail's head is now again well above water and humming along fine with the reduced volume.
The specific problem appears to be Imail queue manager, or whatever it is running the Imail resource allocation show, when it gets hit with big spikes of incoming mail, just like you're doing.
I get bounces that say "undeliverable to [EMAIL PROTECTED] SMTP connection faile"
that sounds like Imail received the msg but couldn't relay it. but that could also mean than Imail picked up a receive msg from overloaded queue but then timed out trying to get an IMail SMTP session or whatever resources Imail SMTP needs to send out. If you were able to see it on your sending pgm, it probably saw Imail SMTP simply refusing incoming connections, which is the tipoff to IMGate admins that Imail is under water.
Since Imail doesn't self-throttle very well and is susceptible to your type of spiky traffic, I recommend you throttle your sending to Imail. Start low to establish a happy baseline, and then increase until Imail starts getting stressed.
Of course, your Imail box has to be tuned, pruned, cleaned, optimized, both Imail and OS, but you've probably tried all of that.
Len
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