[exim] batching messages to ISP

My ISP seems to limit emails being sent out to 50 at a time .Ive got a mail
shot of 258 to send from a PHP application. is there a way of getting exim to
queue the emails and then send 50 at a time to the IPS smtp server at 10
minut intervals until they are all gone ?


PS this isnt in the book either (!)
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p cooper