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I think "smartmail" with cron job feature can deliver content of any module automatically, I paid for develop it to work with older XOOPS ( may be 2.0.13.2 ) but I don't know if it is still working with XOOPS 2.4.x and 2.5
Also I have another module "newslatter" made by Trabis can use for deliver any content but manually. we can release it once Trabis have time for testing it on new versions of XOOPS.