Christopher Chan wrote:
http://qmail.jms1.net/patches/validrcptto.cdb.shtml
There is a better patch for vpopmail support in qmail. A mysql patch
that goes straight the vpopmail mysql database but I am not sure of
its location. The writer even rebuffed one of Inter7's developers when
someone floated the idea of qmail supporting vpopmail's mysql tables
and the developer said he would write it since he was not aware of the
patch's existence. So I believe the Inter7 guy drop it right then and
there or maybe not. I believe it is this one here and the writer was
Italian: http://www.interazioni.it/opensource/chkusr/
postfix trumps chkusr/chkuser just as chkusr/chkuser trumps the cdb
check.
First, chkusr vs rcptto.cdb. tcpserver + qmail-smtpd means a fresh
fork for each new connection. The cdb rcptto means a disk access for
each rcpt to check and regular rebuilds of the cdb database.
chkusr/chkuser helps by keeping I/O of disk (okay we can contest
whether looking up cdbs is better than looking up mysql tables or not
but I think it is fair game to say that mysql lookups are more likely
to be disk I/O free) and by not needing regular rebuilds of a cdb
file. In fact, it offers instant/real-time user existence checks.
In addition, I believe Matt Simerson authored a tcpserver mysql patch to
allow the removal of cdb files altogether. http://www.tnpi.biz - it's
great for heavily loaded servers, because constantly recompiling that
damn file with multiple processes tends to corrupt it.
I love qmail too, but I'm with ya on all the 'unapproved' patches and
it's concurrency limitations.
Rick
