= INSTALLATION = To install this module, run the following commands: perl Makefile.PL make make install = CONFIGURE = Add 'Filter::CheckMessageId' to the list of mail plugins in RT_SiteConfig.pm. Restart web server. If you are running RT-3.8 you will need to use slightly different syntax Set(@MailPlugins, qw(CheckMessageId)); = PERFORMANCE ISSUE = This plugin search messages Id in column 'messageid' of the table 'attachments'. It is strongly recommanded to create an index to speed-up the search in this table. Connect to the database: CREATE INDEX messageid_idx ON attachments (messageid); Enjoy.