ftp://ftp.kfki.hu/pub/packages/perl/CPAN/modules/by-category/19_Mail_and_Usenet_News/  direct

[DIR]XMail/  direct  295+ twin directories
[DIR]Sendmail/  direct  559+ twin directories
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[DIR]NNML/  direct  391+ twin directories
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[DIR]IMAP/  direct  1433+ twin directories
[DIR]GMail/  direct  380+ twin directories