Emails, I get emails.
I get emails from
* A Torah Minute/Midrash Ben Ish Hai
* Arutz Sheva
* Chabad
* Daily Halacha /R. Eli J. Mansour
* JerusalemOnline
* The Institute for Jewish Ideas and Ideals/R. Marc Angel
* Torahweb.org/R. Yakov Haber (& one of his sons, R. Sender Haber)
But the one I always read first and the one I frequently share is from Arlene J. Mathes-Scharf 's Kashrut.com.
Most of what Ms. Mathes-Scharf presents on Kashrut.com is conveniently compiled from a multitude of other sources, mostly kosher certifying sources such as OU, cRc, OK, Star-K and regional kashrut agencies. She also brings in kashrut agencies in other countries, most often Canada, Israel, Mexico, and South Africa.
More than that, and for the careful eater, she also includes warning from the US FDA, and the Canadian Food Inspection Agency, among others. Is a product dangerous due to Cryptosporidium? She lets us know.
If a food or food-related product is recalled - such as wine cups that exceed FDA limits on leachable lead and cadmium - Kashrut.com lets subscribers know.
The Passover page doesn't list what's permitted and what is not; instead it provides links to certifying agencies (ibid.) and some of special interest on Passover such as JSOR and Seattle Va'ad, both of which are of interest to Sephardi/Mizrahi readers.
Ms. Mathes-Scharf rarely writes anything herself - she has experts to do that for her - but when she does, as with her Misc. Passover Product Information, she carefully cites her sources.
The list is free, both as an email with links to Kashrut.com and directly at Kashrut.com.
Ms. Mathes-Scharf lists herself as a Food Scientist - Kosher Food Specialist.
If you already are inundated by emails, I would strongly encourage you to cancel one and replace it with Kashrut.com. If kashrut or kashrus concerns you, get this email or remind yourself to visit Kashrut.com at least once-a-week.