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The main disadvantages of the SQL version are that you need to be familiar with the SQL server, the binaries are quite a bit larger, and you are trusting your addresses to a large database program, rather than a small and easily audited set of ezmlm programs. Also, the SQL server becomes a single point of failure.
Ezmlm with SQL support continues to rely on qmail stability. If connection fails, ezmlm aborts with a temporary error causing redelivery at a later time point.