Q. If one was Mekabel Shabbos before receiving an email confirming that the Eruv is up, does he need to avoid carrying on Shabbos until he hears that it is up from someone who was Mekabel (received it) later?

A. The fact is that one can carry on Shabbos regardless of receiving the email attesting that the Eruv is OK, since we rely on the existing Kashrus of the Eruv, unless we know otherwise.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller, Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a