V6, mail campaigns, cronjob, php memory allocation

[Darrensouthafrica]

My sugarcrm is installed on a hosted server and I can only get 50mb allocated to php. So everytime the cronjob starts running it fails, the a vm is exceeded, and the server is killing the process
can some please tell me how much memory php needs to run mail campaigns automatically, or can the cronjob be adjusted

thx
darren

[Darrensouthafrica]

I have tried setting up the mail sending in two different ways.
1. Send 6 mails every minute
2 send 50 mails every 6 minutes
in both case keeping it under 500 An Hour
if I manuat start the cron then it does start. And says it's complete but if you check the log it gives a vm error.