Hi, Am 12.10.2009 um 13:29 schrieb Richard Elling:
I've not implemented qmail, but it appears to be just an MTA. These do store-and-forward, so it is unlikely that they need to use sync calls. It will create a lot of files, but that is usually done async.
Async I/O for mail servers is a big no go. I worked for Canbox, a large unified messaging provider during the dotcom-boom. My experience: You can afford to lose a index because you can reconstruct it but your aren't allowed to loose a single mail. And this would be the consequence for using async for the spool.
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