Hot answers tagged time-zone
Partial answer: There is no Shabbos problem of sending it even if it is already Shabbos where the recipient is (see last paragraph here).
Rabbi Frand once dealt with this problem by speaking of the case of an answering machine or a FAX. While leaving a message on an answering machine in Eretz Yisroel would not be a problem as long as the recipient did not actually use it, you could cause a problem if the person at the other end would actually be mechalel shabbos as a result of your leaving the ...
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