Who hosts your domain? I'd check with them on incoming port settings. A number of ISPs of late are changing their settings because port 25 is just too vulnerable. Some don't think this affects mobile access but it can. I changed mine when my ISP told me to and have had no problems. Just a thought. I've also just let my phone run through the check settings screen (little bar scrolling) when i seem to not be getting my notifications. Seems to reset it.
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