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From: Greg Hackney (hackney_at_swbell.net)
Date: Mon Feb 03 2003 - 12:39:20 CST

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    Postfix here is having occasional DNS timeout problems.

    It's caching DNS forwards through a couple of private
    chained DNS servers before hitting the public's DNS servers.

    Some of the public's DNS servers are occasionally a bit slow to respond,
    and some of those use short expiry intervals, so the MX and A data isn't
    always cached locally.

    Am I correct in that Postfix itself has no configurable DNS timeout
    parameters?

    Also, am I correct that Postfix invokes res_query(), which uses
    BIND's resolver library, which uses RES_TIMEOUT, which is defined in
    /usr/include/resolv.a (5 seconds). And therefore statically linked
    Postfix binaries would need to be relinked with a new libresolv.a
    library whose RES_TIMEOUT has been increased? 

    --
Greg