[Exim] Current release of Exim

Hi,

What is the current release of Exim? On the ftp server, the stable release
is marked as version 3.22, but there is a version 3.21. Is version 3.31
stable, and if so should it be used in preference to version 3.22?

Thanks, Alec

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Alec Edworthy
alec@???