push email not pushing?

[eyeball]

i have setup push email on 3 devices all the same with mobile 2005, self seigned ssl that i have imported on all the devices. emails work fine on all but one of the devices.

it will only work when i manually synchronize, i read on google that corrupted calendars can cause this but i cant find any corrupted items and have stopped it synching everything but emails to the device still with no luck.

has anyone had this before?

thanks