Thanks Thomas I think this has put me on the right track. i found and tweeked the mysqltuner.pl to run on mysql database (needed the host ip address to login into mysql)
This suggested that i increase afew max table/cache values to optimize my database. i then Optimized all my databases and increase the Virtual memory on the machine This has resulted in me being able to send emails from RT again (yeah!), but the (fork::abort: address space needed by xxx) errors are still sometimes appearing in the error.log but as of yet have not caused any more disruption knowing that this will be a ticking time bomb if i leave it in this state, Do you have any advice on how to tune Apache? Is there an equivalent 'Apachetuner.pl' that you know of as the mysqltuner.pl was very handly for a beginner like me -- View this message in context: http://requesttracker.8502.n7.nabble.com/Error-when-sending-or-reciving-mail-fork-abort-address-space-needed-by-xxx-tp54702p54715.html Sent from the Request Tracker - User mailing list archive at Nabble.com.